diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1406bc720e0626711352ae2630cd80b7fa94fc1a..29f2c9a5f95e16130537e7cb85bb65b9bd38d94a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,20 @@ entry.
 
 ## 13.1.6 (2020-08-05)
 
-- No changes.
+### Security (11 changes)
+
+- Add decompressed archive size validation on Project/Group Import. !562
+- Enforce 2FA on Doorkeeper controllers.
+- Refresh project authorizations when transferring groups.
+- Stop excess logs from failure to send invite email when group no longer exists.
+- Verify confirmed email for OAuth Authorize POST endpoint.
+- Revoke OAuth grants when a user revokes an application.
+- Fix XSS in Markdown reference tooltips.
+- Fix XSS in milestone tooltips.
+- Fix xss vulnerability on jobs view.
+- Block 40-character hexadecimal branches.
+- Update GitLab Runner Helm Chart to 0.17.2.
+
 
 ## 13.1.5 (2020-07-23)
 
diff --git a/app/assets/javascripts/jobs/components/environments_block.vue b/app/assets/javascripts/jobs/components/environments_block.vue
index c34a3488dbd7b7cad5800ac929d5d22da0333a44..e9bc55a8a321456a15a8671d4a3b5547ccdb3964 100644
--- a/app/assets/javascripts/jobs/components/environments_block.vue
+++ b/app/assets/javascripts/jobs/components/environments_block.vue
@@ -1,11 +1,15 @@
 <script>
-import { escape, isEmpty } from 'lodash';
+import { isEmpty } from 'lodash';
 import CiIcon from '~/vue_shared/components/ci_icon.vue';
-import { sprintf, __ } from '../../locale';
+import { __ } from '../../locale';
+import { GlSprintf, GlLink } from '@gitlab/ui';
 
 export default {
+  creatingEnvironment: 'creating',
   components: {
     CiIcon,
+    GlSprintf,
+    GlLink,
   },
   props: {
     deploymentStatus: {
@@ -31,7 +35,7 @@ export default {
           return this.outOfDateEnvironmentMessage();
         case 'failed':
           return this.failedEnvironmentMessage();
-        case 'creating':
+        case this.$options.creatingEnvironment:
           return this.creatingEnvironmentMessage();
         default:
           return '';
@@ -39,17 +43,12 @@ export default {
     },
     environmentLink() {
       if (this.hasEnvironment) {
-        return sprintf(
-          '%{startLink}%{name}%{endLink}',
-          {
-            startLink: `<a href="${this.deploymentStatus.environment.environment_path}" class="js-environment-link">`,
-            name: escape(this.deploymentStatus.environment.name),
-            endLink: '</a>',
-          },
-          false,
-        );
+        return {
+          link: this.deploymentStatus.environment.environment_path,
+          name: this.deploymentStatus.environment.name,
+        };
       }
-      return '';
+      return {};
     },
     hasLastDeployment() {
       return this.hasEnvironment && this.deploymentStatus.environment.last_deployment;
@@ -74,201 +73,107 @@ export default {
       }
 
       const { name, path } = this.deploymentCluster;
-      const escapedName = escape(name);
-      const escapedPath = escape(path);
-
-      if (!escapedPath) {
-        return escapedName;
-      }
 
-      return sprintf(
-        '%{startLink}%{name}%{endLink}',
-        {
-          startLink: `<a href="${escapedPath}" class="js-job-cluster-link">`,
-          name: escapedName,
-          endLink: '</a>',
-        },
-        false,
-      );
+      return {
+        path,
+        name,
+      };
     },
     kubernetesNamespace() {
       return this.hasCluster ? this.deploymentCluster.kubernetes_namespace : null;
     },
+    deploymentLink() {
+      return {
+        path: this.lastDeploymentPath,
+        name:
+          this.deploymentStatus.status === this.$options.creatingEnvironment
+            ? __('latest deployment')
+            : __('most recent deployment'),
+      };
+    },
   },
   methods: {
-    deploymentLink(name) {
-      return sprintf(
-        '%{startLink}%{name}%{endLink}',
-        {
-          startLink: `<a href="${this.lastDeploymentPath}" class="js-job-deployment-link">`,
-          name,
-          endLink: '</a>',
-        },
-        false,
-      );
-    },
     failedEnvironmentMessage() {
-      const { environmentLink } = this;
-
-      return sprintf(
-        __('The deployment of this job to %{environmentLink} did not succeed.'),
-        { environmentLink },
-        false,
-      );
+      return __('The deployment of this job to %{environmentLink} did not succeed.');
     },
     lastEnvironmentMessage() {
-      const { environmentLink, clusterNameOrLink, hasCluster, kubernetesNamespace } = this;
-      if (hasCluster) {
-        if (kubernetesNamespace) {
-          return sprintf(
-            __(
-              'This job is deployed to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}.',
-            ),
-            { environmentLink, clusterNameOrLink, kubernetesNamespace },
-            false,
+      if (this.hasCluster) {
+        if (this.kubernetesNamespace) {
+          return __(
+            'This job is deployed to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}.',
           );
         }
         // we know the cluster but not the namespace
-        return sprintf(
-          __('This job is deployed to %{environmentLink} using cluster %{clusterNameOrLink}.'),
-          { environmentLink, clusterNameOrLink },
-          false,
-        );
+        return __('This job is deployed to %{environmentLink} using cluster %{clusterNameOrLink}.');
       }
       // not a cluster deployment
-      return sprintf(__('This job is deployed to %{environmentLink}.'), { environmentLink }, false);
+      return __('This job is deployed to %{environmentLink}.');
     },
     outOfDateEnvironmentMessage() {
-      const {
-        hasLastDeployment,
-        hasCluster,
-        environmentLink,
-        clusterNameOrLink,
-        kubernetesNamespace,
-      } = this;
-
-      if (hasLastDeployment) {
-        const deploymentLink = this.deploymentLink(__('most recent deployment'));
-        if (hasCluster) {
-          if (kubernetesNamespace) {
-            return sprintf(
-              __(
-                'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}. View the %{deploymentLink}.',
-              ),
-              { environmentLink, clusterNameOrLink, kubernetesNamespace, deploymentLink },
-              false,
+      if (this.hasLastDeployment) {
+        if (this.hasCluster) {
+          if (this.kubernetesNamespace) {
+            return __(
+              'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}. View the %{deploymentLink}.',
             );
           }
           // we know the cluster but not the namespace
-          return sprintf(
-            __(
-              'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink}. View the %{deploymentLink}.',
-            ),
-            { environmentLink, clusterNameOrLink, deploymentLink },
-            false,
+          return __(
+            'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink}. View the %{deploymentLink}.',
           );
         }
         // not a cluster deployment
-        return sprintf(
-          __(
-            'This job is an out-of-date deployment to %{environmentLink}. View the %{deploymentLink}.',
-          ),
-          { environmentLink, deploymentLink },
-          false,
+        return __(
+          'This job is an out-of-date deployment to %{environmentLink}. View the %{deploymentLink}.',
         );
       }
       // no last deployment, i.e. this is the first deployment
-      if (hasCluster) {
-        if (kubernetesNamespace) {
-          return sprintf(
-            __(
-              'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}.',
-            ),
-            { environmentLink, clusterNameOrLink, kubernetesNamespace },
-            false,
+      if (this.hasCluster) {
+        if (this.kubernetesNamespace) {
+          return __(
+            'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}.',
           );
         }
         // we know the cluster but not the namespace
-        return sprintf(
-          __(
-            'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink}.',
-          ),
-          { environmentLink, clusterNameOrLink },
-          false,
+        return __(
+          'This job is an out-of-date deployment to %{environmentLink} using cluster %{clusterNameOrLink}.',
         );
       }
       // not a cluster deployment
-      return sprintf(
-        __('This job is an out-of-date deployment to %{environmentLink}.'),
-        { environmentLink },
-        false,
-      );
+      return __('This job is an out-of-date deployment to %{environmentLink}.');
     },
     creatingEnvironmentMessage() {
-      const {
-        hasLastDeployment,
-        hasCluster,
-        environmentLink,
-        clusterNameOrLink,
-        kubernetesNamespace,
-      } = this;
-
-      if (hasLastDeployment) {
-        const deploymentLink = this.deploymentLink(__('latest deployment'));
-        if (hasCluster) {
-          if (kubernetesNamespace) {
-            return sprintf(
-              __(
-                'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}. This will overwrite the %{deploymentLink}.',
-              ),
-              { environmentLink, clusterNameOrLink, kubernetesNamespace, deploymentLink },
-              false,
+      if (this.hasLastDeployment) {
+        if (this.hasCluster) {
+          if (this.kubernetesNamespace) {
+            return __(
+              'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}. This will overwrite the %{deploymentLink}.',
             );
           }
           // we know the cluster but not the namespace
-          return sprintf(
-            __(
-              'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink}. This will overwrite the %{deploymentLink}.',
-            ),
-            { environmentLink, clusterNameOrLink, deploymentLink },
-            false,
+          return __(
+            'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink}. This will overwrite the %{deploymentLink}.',
           );
         }
         // not a cluster deployment
-        return sprintf(
-          __(
-            'This job is creating a deployment to %{environmentLink}. This will overwrite the %{deploymentLink}.',
-          ),
-          { environmentLink, deploymentLink },
-          false,
+        return __(
+          'This job is creating a deployment to %{environmentLink}. This will overwrite the %{deploymentLink}.',
         );
       }
       // no last deployment, i.e. this is the first deployment
-      if (hasCluster) {
-        if (kubernetesNamespace) {
-          return sprintf(
-            __(
-              'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}.',
-            ),
-            { environmentLink, clusterNameOrLink, kubernetesNamespace },
-            false,
+      if (this.hasCluster) {
+        if (this.kubernetesNamespace) {
+          return __(
+            'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink} and namespace %{kubernetesNamespace}.',
           );
         }
         // we know the cluster but not the namespace
-        return sprintf(
-          __(
-            'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink}.',
-          ),
-          { environmentLink, clusterNameOrLink },
-          false,
+        return __(
+          'This job is creating a deployment to %{environmentLink} using cluster %{clusterNameOrLink}.',
         );
       }
       // not a cluster deployment
-      return sprintf(
-        __('This job is creating a deployment to %{environmentLink}.'),
-        { environmentLink },
-        false,
-      );
+      return __('This job is creating a deployment to %{environmentLink}.');
     },
   },
 };
@@ -277,7 +182,37 @@ export default {
   <div class="prepend-top-default append-bottom-default js-environment-container">
     <div class="environment-information">
       <ci-icon :status="iconStatus" />
-      <p class="inline gl-mb-0" v-html="environment"></p>
+      <p class="inline gl-mb-0">
+        <gl-sprintf :message="environment">
+          <template #environmentLink>
+            <gl-link
+              v-if="hasEnvironment"
+              :href="environmentLink.link"
+              data-testid="job-environment-link"
+              v-text="environmentLink.name"
+            />
+          </template>
+          <template #clusterNameOrLink>
+            <gl-link
+              v-if="clusterNameOrLink.path"
+              :href="clusterNameOrLink.path"
+              data-testid="job-cluster-link"
+              v-text="clusterNameOrLink.name"
+            />
+            <template v-else>{{ clusterNameOrLink.name }}</template>
+          </template>
+          <template #kubernetesNamespace>
+            <template>{{ kubernetesNamespace }}</template>
+          </template>
+          <template #deploymentLink>
+            <gl-link
+              :href="deploymentLink.path"
+              data-testid="job-deployment-link"
+              v-text="deploymentLink.name"
+            />
+          </template>
+        </gl-sprintf>
+      </p>
     </div>
   </div>
 </template>
diff --git a/app/controllers/concerns/enforces_two_factor_authentication.rb b/app/controllers/concerns/enforces_two_factor_authentication.rb
index 6c443611a606d17a78ce0ae1cde60a24a01b2d7a..f1dd46648f1d2341eab19a82aadc13739ca49bf1 100644
--- a/app/controllers/concerns/enforces_two_factor_authentication.rb
+++ b/app/controllers/concerns/enforces_two_factor_authentication.rb
@@ -12,10 +12,17 @@ module EnforcesTwoFactorAuthentication
 
   included do
     before_action :check_two_factor_requirement
-    helper_method :two_factor_grace_period_expired?, :two_factor_skippable?
+
+    # to include this in controllers inheriting from `ActionController::Metal`
+    # we need to add this block
+    if respond_to?(:helper_method)
+      helper_method :two_factor_grace_period_expired?, :two_factor_skippable?
+    end
   end
 
   def check_two_factor_requirement
+    return unless respond_to?(:current_user)
+
     if two_factor_authentication_required? && current_user_requires_two_factor?
       redirect_to profile_two_factor_auth_path
     end
diff --git a/app/controllers/oauth/applications_controller.rb b/app/controllers/oauth/applications_controller.rb
index 2c3e60d12b773eb6381f6f1fe3e67e70bada695f..de49caeb51141829f1537750075e0d83223060c2 100644
--- a/app/controllers/oauth/applications_controller.rb
+++ b/app/controllers/oauth/applications_controller.rb
@@ -2,7 +2,6 @@
 
 class Oauth::ApplicationsController < Doorkeeper::ApplicationsController
   include Gitlab::GonHelper
-  include Gitlab::Allowable
   include PageLayoutHelper
   include OauthApplications
   include Gitlab::Experimentation::ControllerConcern
@@ -17,8 +16,6 @@ class Oauth::ApplicationsController < Doorkeeper::ApplicationsController
   before_action :add_gon_variables
   before_action :load_scopes, only: [:index, :create, :edit, :update]
 
-  helper_method :can?
-
   layout 'profile'
 
   def index
diff --git a/app/controllers/oauth/authorizations_controller.rb b/app/controllers/oauth/authorizations_controller.rb
index f6ad2bf5312d7b7b148a10ff6cc5d9710057beab..6e8686ee90b602e56e506a67a1f43a74a00118be 100644
--- a/app/controllers/oauth/authorizations_controller.rb
+++ b/app/controllers/oauth/authorizations_controller.rb
@@ -4,7 +4,7 @@ class Oauth::AuthorizationsController < Doorkeeper::AuthorizationsController
   include Gitlab::Experimentation::ControllerConcern
   include InitializesCurrentUserMode
 
-  before_action :verify_confirmed_email!, only: [:new]
+  before_action :verify_confirmed_email!
 
   layout 'profile'
 
diff --git a/app/controllers/oauth/authorized_applications_controller.rb b/app/controllers/oauth/authorized_applications_controller.rb
index addec71f0bfcdc1239b31f6753bd835ebb86b1eb..3f476c0d717397b8d1335485dd1bb3d23793db03 100644
--- a/app/controllers/oauth/authorized_applications_controller.rb
+++ b/app/controllers/oauth/authorized_applications_controller.rb
@@ -16,7 +16,7 @@ class Oauth::AuthorizedApplicationsController < Doorkeeper::AuthorizedApplicatio
     if params[:token_id].present?
       current_resource_owner.oauth_authorized_tokens.find(params[:token_id]).revoke
     else
-      Doorkeeper::AccessToken.revoke_all_for(params[:id], current_resource_owner)
+      Doorkeeper::Application.revoke_tokens_and_grants_for(params[:id], current_resource_owner)
     end
 
     redirect_to applications_profile_url,
diff --git a/app/controllers/oauth/token_info_controller.rb b/app/controllers/oauth/token_info_controller.rb
index 492c24b53b152c7406c51d92a80163b3d1016eaf..e37f8992d9273e18412ce5209fc85603acba65fa 100644
--- a/app/controllers/oauth/token_info_controller.rb
+++ b/app/controllers/oauth/token_info_controller.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class Oauth::TokenInfoController < Doorkeeper::TokenInfoController
+  include EnforcesTwoFactorAuthentication
+
   def show
     if doorkeeper_token && doorkeeper_token.accessible?
       token_json = doorkeeper_token.as_json
diff --git a/app/controllers/oauth/tokens_controller.rb b/app/controllers/oauth/tokens_controller.rb
new file mode 100644
index 0000000000000000000000000000000000000000..012fa318eea32bf89a14555a1281adcda244790d
--- /dev/null
+++ b/app/controllers/oauth/tokens_controller.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class Oauth::TokensController < Doorkeeper::TokensController
+  include EnforcesTwoFactorAuthentication
+end
diff --git a/app/helpers/issuables_helper.rb b/app/helpers/issuables_helper.rb
index a848c814742ffb146d8785823737b53badc7427e..5715e0bcf411ecb00d93baf29cb81b9fdc1f53b2 100644
--- a/app/helpers/issuables_helper.rb
+++ b/app/helpers/issuables_helper.rb
@@ -29,7 +29,7 @@ module IssuablesHelper
   def sidebar_milestone_tooltip_label(milestone)
     return _('Milestone') unless milestone.present?
 
-    [milestone[:title], sidebar_milestone_remaining_days(milestone) || _('Milestone')].join('<br/>')
+    [escape_once(milestone[:title]), sidebar_milestone_remaining_days(milestone) || _('Milestone')].join('<br/>')
   end
 
   def sidebar_milestone_remaining_days(milestone)
diff --git a/app/mailers/emails/members.rb b/app/mailers/emails/members.rb
index 06d2219d6a9d886a0cfb7348fb54687df2bfcd3f..07ce9bba7841c1b874c2167635dd292cbcd9e5d5 100644
--- a/app/mailers/emails/members.rb
+++ b/app/mailers/emails/members.rb
@@ -13,6 +13,8 @@ module Emails
       @member_source_type = member_source_type
       @member_id = member_id
 
+      return unless member_exists?
+
       user = User.find(recipient_id)
 
       member_email_with_layout(
@@ -24,6 +26,8 @@ module Emails
       @member_source_type = member_source_type
       @member_id = member_id
 
+      return unless member_exists?
+
       member_email_with_layout(
         to: member.user.notification_email_for(notification_group),
         subject: subject("Access to the #{member_source.human_name} #{member_source.model_name.singular} was granted"))
@@ -45,6 +49,8 @@ module Emails
       @member_id = member_id
       @token = token
 
+      return unless member_exists?
+
       member_email_with_layout(
         to: member.invite_email,
         subject: subject("Invitation to join the #{member_source.human_name} #{member_source.model_name.singular}"))
@@ -53,6 +59,8 @@ module Emails
     def member_invite_accepted_email(member_source_type, member_id)
       @member_source_type = member_source_type
       @member_id = member_id
+
+      return unless member_exists?
       return unless member.created_by
 
       member_email_with_layout(
@@ -74,9 +82,11 @@ module Emails
         subject: subject('Invitation declined'))
     end
 
+    # rubocop: disable CodeReuse/ActiveRecord
     def member
-      @member ||= Member.find(@member_id)
+      @member ||= Member.find_by(id: @member_id)
     end
+    # rubocop: enable CodeReuse/ActiveRecord
 
     def member_source
       @member_source ||= member.source
@@ -88,6 +98,11 @@ module Emails
 
     private
 
+    def member_exists?
+      Gitlab::AppLogger.info("Tried to send an email invitation for a deleted group. Member id: #{@member_id}") if member.blank?
+      member.present?
+    end
+
     def member_source_class
       @member_source_type.classify.constantize
     end
diff --git a/app/models/clusters/applications/runner.rb b/app/models/clusters/applications/runner.rb
index 6d3b6c4ed8f17e12e489277e523696cb52a1aade..f0050b1820437bbb85e932aff11911c94b896429 100644
--- a/app/models/clusters/applications/runner.rb
+++ b/app/models/clusters/applications/runner.rb
@@ -3,7 +3,7 @@
 module Clusters
   module Applications
     class Runner < ApplicationRecord
-      VERSION = '0.17.1'
+      VERSION = '0.17.2'
 
       self.table_name = 'clusters_applications_runners'
 
diff --git a/app/services/groups/transfer_service.rb b/app/services/groups/transfer_service.rb
index fbbf4ce8baf8a7bc5b2a8597ed235b36b29ed5e1..f2fb494500dc43e5a6f138467e342867b64a9af9 100644
--- a/app/services/groups/transfer_service.rb
+++ b/app/services/groups/transfer_service.rb
@@ -37,6 +37,7 @@ module Groups
 
     # Overridden in EE
     def post_update_hooks(updated_project_ids)
+      refresh_project_authorizations
     end
 
     def ensure_allowed_transfer
@@ -121,6 +122,16 @@ module Groups
       @group.add_owner(current_user)
     end
 
+    def refresh_project_authorizations
+      ProjectAuthorization.where(project_id: @group.all_projects.select(:id)).delete_all # rubocop: disable CodeReuse/ActiveRecord
+
+      # refresh authorized projects for current_user immediately
+      current_user.refresh_authorized_projects
+
+      # schedule refreshing projects for all the members of the group
+      @group.refresh_members_authorized_projects
+    end
+
     def raise_transfer_error(message)
       raise TransferError, localized_error_messages[message]
     end
diff --git a/app/workers/authorized_projects_worker.rb b/app/workers/authorized_projects_worker.rb
index 62eea8e0462cd105f1880b4321e7cd694110fde0..f5132459131dcc54c21d16def872fc033ecce525 100644
--- a/app/workers/authorized_projects_worker.rb
+++ b/app/workers/authorized_projects_worker.rb
@@ -16,6 +16,9 @@ class AuthorizedProjectsWorker
   if Rails.env.test?
     def self.bulk_perform_and_wait(args_list, timeout: 10)
     end
+
+    def self.bulk_perform_inline(args_list)
+    end
   end
 
   # rubocop: disable CodeReuse/ActiveRecord
diff --git a/config/routes.rb b/config/routes.rb
index 598a52cddb350dedb0509a9bb7a28e9180b2e3b8..dca30ebf49292bf44b000de2e71ce8f90aa4027b 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -24,7 +24,8 @@ Rails.application.routes.draw do
     controllers applications: 'oauth/applications',
                 authorized_applications: 'oauth/authorized_applications',
                 authorizations: 'oauth/authorizations',
-                token_info: 'oauth/token_info'
+                token_info: 'oauth/token_info',
+                tokens: 'oauth/tokens'
   end
 
   # This prefixless path is required because Jira gets confused if we set it up with a path
diff --git a/doc/push_rules/push_rules.md b/doc/push_rules/push_rules.md
index e0ca914b67be26b82cc5fd7238ce034a95716a75..f958eaa1b21865255664f41abb5ed5f0c2b60f9a 100644
--- a/doc/push_rules/push_rules.md
+++ b/doc/push_rules/push_rules.md
@@ -56,6 +56,13 @@ If you have other target branches, include them in your regex. (See [Enabling pu
 The default branch also defaults to being a [protected branch](../user/project/protected_branches.md),
 which already limits users from pushing directly.
 
+#### Default restricted branch names
+
+> Introduced in GitLab 12.10.
+
+By default, GitLab restricts certain formats of branch names for security purposes.
+Currently 40-character hexadecimal names, similar to Git commit hashes, are prohibited.
+
 ### Custom Push Rules **(CORE ONLY)**
 
 It's possible to create custom push rules rather than the push rules available in
diff --git a/doc/security/project_import_decompressed_archive_size_limits.md b/doc/security/project_import_decompressed_archive_size_limits.md
new file mode 100644
index 0000000000000000000000000000000000000000..c15cd639951847c0cdb31f376f77176ae997e3e1
--- /dev/null
+++ b/doc/security/project_import_decompressed_archive_size_limits.md
@@ -0,0 +1,28 @@
+---
+type: reference, howto
+---
+
+# Project Import Decompressed Archive Size Limits
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/31564) in GitLab 13.1.
+
+When using [Project Import](../user/project/settings/import_export.md), the size of the decompressed project archive is limited to 10Gb.
+
+If decompressed size exceeds this limit, `Decompressed archive size validation failed` error is returned.
+
+## Enable/disable size validation
+
+Decompressed size validation is enabled by default.
+If you have a project with decompressed size exceeding this limit,
+it is possible to disable the validation by turning off the
+`validate_import_decompressed_archive_size` feature flag.
+
+Start a [Rails console](../administration/troubleshooting/debug.md#starting-a-rails-console-session).
+
+```ruby
+# Disable
+Feature.disable(:validate_import_decompressed_archive_size)
+
+# Enable
+Feature.enable(:validate_import_decompressed_archive_size)
+```
diff --git a/lib/banzai/filter/label_reference_filter.rb b/lib/banzai/filter/label_reference_filter.rb
index 7cda4699ae620b2210fc7874cb22fc1daab1ea93..2ab88620df15ae52cfd3f0cb9d8ce8dc2826b271 100644
--- a/lib/banzai/filter/label_reference_filter.rb
+++ b/lib/banzai/filter/label_reference_filter.rb
@@ -119,3 +119,5 @@ module Banzai
     end
   end
 end
+
+Banzai::Filter::LabelReferenceFilter.prepend_if_ee('EE::Banzai::Filter::LabelReferenceFilter')
diff --git a/lib/banzai/filter/reference_filter.rb b/lib/banzai/filter/reference_filter.rb
index 9e932ccf9f8fc22df100f1fc1bb8f2307a7ae6b8..e8c9bb9cd3830d25b61ebcee73084a80cf67d570 100644
--- a/lib/banzai/filter/reference_filter.rb
+++ b/lib/banzai/filter/reference_filter.rb
@@ -38,7 +38,6 @@ module Banzai
         attributes[:reference_type] ||= self.class.reference_type
         attributes[:container] ||= 'body'
         attributes[:placement] ||= 'top'
-        attributes[:html] ||= 'true'
         attributes.delete(:original) if context[:no_original_data]
         attributes.map do |key, value|
           %Q(data-#{key.to_s.dasherize}="#{escape_once(value)}")
diff --git a/lib/gitlab/base_doorkeeper_controller.rb b/lib/gitlab/base_doorkeeper_controller.rb
index b78993aba306d50b6032f054ef2725f5fe4fe889..0f370850b5b6c0122681e3edbe8d8950ab2ea540 100644
--- a/lib/gitlab/base_doorkeeper_controller.rb
+++ b/lib/gitlab/base_doorkeeper_controller.rb
@@ -5,6 +5,8 @@
 module Gitlab
   class BaseDoorkeeperController < ActionController::Base
     include Gitlab::Allowable
+    include EnforcesTwoFactorAuthentication
+
     helper_method :can?
   end
 end
diff --git a/lib/gitlab/checks/branch_check.rb b/lib/gitlab/checks/branch_check.rb
index 7be0ef05a496b98a6db5b994fb32f9924c74b759..ad2a718ef676a6f9dc0152cab7a98d3cea4da249 100644
--- a/lib/gitlab/checks/branch_check.rb
+++ b/lib/gitlab/checks/branch_check.rb
@@ -12,7 +12,8 @@ module Gitlab
         push_protected_branch: 'You are not allowed to push code to protected branches on this project.',
         create_protected_branch: 'You are not allowed to create protected branches on this project.',
         invalid_commit_create_protected_branch: 'You can only use an existing protected branch ref as the basis of a new protected branch.',
-        non_web_create_protected_branch: 'You can only create protected branches using the web interface and API.'
+        non_web_create_protected_branch: 'You can only create protected branches using the web interface and API.',
+        prohibited_hex_branch_name: 'You cannot create a branch with a 40-character hexadecimal branch name.'
       }.freeze
 
       LOG_MESSAGES = {
@@ -32,11 +33,20 @@ module Gitlab
           end
         end
 
+        prohibited_branch_checks
         protected_branch_checks
       end
 
       private
 
+      def prohibited_branch_checks
+        return unless Feature.enabled?(:prohibit_hexadecimal_branch_names, project, default_enabled: true)
+
+        if branch_name =~ /\A\h{40}\z/
+          raise GitAccess::ForbiddenError, ERROR_MESSAGES[:prohibited_hex_branch_name]
+        end
+      end
+
       def protected_branch_checks
         logger.log_timed(LOG_MESSAGES[:protected_branch_checks]) do
           return unless ProtectedBranch.protected?(project, branch_name) # rubocop:disable Cop/AvoidReturnFromBlocks
diff --git a/lib/gitlab/import_export/decompressed_archive_size_validator.rb b/lib/gitlab/import_export/decompressed_archive_size_validator.rb
new file mode 100644
index 0000000000000000000000000000000000000000..219821a7150f4939832cb2ebc05d8f3300129779
--- /dev/null
+++ b/lib/gitlab/import_export/decompressed_archive_size_validator.rb
@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+require 'zlib'
+
+module Gitlab
+  module ImportExport
+    class DecompressedArchiveSizeValidator
+      include Gitlab::Utils::StrongMemoize
+
+      DEFAULT_MAX_BYTES = 10.gigabytes.freeze
+      CHUNK_SIZE = 4096.freeze
+
+      attr_reader :error
+
+      def initialize(archive_path:, max_bytes: self.class.max_bytes)
+        @archive_path = archive_path
+        @max_bytes = max_bytes
+        @bytes_read = 0
+        @total_reads = 0
+        @denominator = 5
+        @error = nil
+      end
+
+      def valid?
+        strong_memoize(:valid) do
+          validate
+        end
+      end
+
+      def self.max_bytes
+        DEFAULT_MAX_BYTES
+      end
+
+      def archive_file
+        @archive_file ||= File.open(@archive_path)
+      end
+
+      private
+
+      def validate
+        until archive_file.eof?
+          compressed_chunk = archive_file.read(CHUNK_SIZE)
+
+          inflate_stream.inflate(compressed_chunk) do |chunk|
+            @bytes_read += chunk.size
+            @total_reads += 1
+          end
+
+          # Start garbage collection every 5 reads in order
+          # to prevent memory bloat during archive decompression
+          GC.start if gc_start?
+
+          if @bytes_read > @max_bytes
+            @error = error_message
+
+            return false
+          end
+        end
+
+        true
+      rescue => e
+        @error = error_message
+
+        Gitlab::ErrorTracking.track_exception(e)
+
+        Gitlab::Import::Logger.info(
+          message: @error,
+          error: e.message
+        )
+
+        false
+      ensure
+        inflate_stream.close
+        archive_file.close
+      end
+
+      def inflate_stream
+        @inflate_stream ||= Zlib::Inflate.new(Zlib::MAX_WBITS + 32)
+      end
+
+      def gc_start?
+        @total_reads % @denominator == 0
+      end
+
+      def error_message
+        _('Decompressed archive size validation failed.')
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/import_export/file_importer.rb b/lib/gitlab/import_export/file_importer.rb
index 9d04d55770db8c806b96dbff4f936006deac10d6..3cb1eb72cebe118cac815b2227ecd28368fe5f9e 100644
--- a/lib/gitlab/import_export/file_importer.rb
+++ b/lib/gitlab/import_export/file_importer.rb
@@ -28,6 +28,7 @@ module Gitlab
         copy_archive
 
         wait_for_archived_file do
+          validate_decompressed_archive_size if Feature.enabled?(:validate_import_decompressed_archive_size, default_enabled: true)
           decompress_archive
         end
       rescue => e
@@ -82,6 +83,14 @@ module Gitlab
       def extracted_files
         Dir.glob("#{@shared.export_path}/**/*", File::FNM_DOTMATCH).reject { |f| IGNORED_FILENAMES.include?(File.basename(f)) }
       end
+
+      def validate_decompressed_archive_size
+        raise ImporterError.new(size_validator.error) unless size_validator.valid?
+      end
+
+      def size_validator
+        @size_validator ||= DecompressedArchiveSizeValidator.new(archive_path: @archive_file)
+      end
     end
   end
 end
diff --git a/lib/gitlab/markdown_cache.rb b/lib/gitlab/markdown_cache.rb
index 21797bf988d84d2997627b3b1dc8541558a2d1d6..ac3492dbe331989bb509c85328e088d2370cbe0c 100644
--- a/lib/gitlab/markdown_cache.rb
+++ b/lib/gitlab/markdown_cache.rb
@@ -3,7 +3,7 @@
 module Gitlab
   module MarkdownCache
     # Increment this number every time the renderer changes its output
-    CACHE_COMMONMARK_VERSION        = 23
+    CACHE_COMMONMARK_VERSION        = 24
     CACHE_COMMONMARK_VERSION_START  = 10
 
     BaseError = Class.new(StandardError)
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 77eb977633db5e609bcab21218dbf2092c99c152..5198f084af375f1597593d514f0e68b32a5d918c 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -7127,6 +7127,9 @@ msgstr ""
 msgid "Decline and sign out"
 msgstr ""
 
+msgid "Decompressed archive size validation failed."
+msgstr ""
+
 msgid "Default Branch"
 msgstr ""
 
diff --git a/spec/controllers/oauth/applications_controller_spec.rb b/spec/controllers/oauth/applications_controller_spec.rb
index f20204b6718f26da3f42ca454c8ebf5937d8fb2d..33349037260a4fc0b2fdcb26e69f3b54da6f49f6 100644
--- a/spec/controllers/oauth/applications_controller_spec.rb
+++ b/spec/controllers/oauth/applications_controller_spec.rb
@@ -19,12 +19,29 @@ RSpec.describe Oauth::ApplicationsController do
       it { is_expected.to redirect_to(new_user_session_path) }
     end
 
+    shared_examples 'redirects to 2fa setup page when the user requires it' do
+      context 'when 2fa is set up on application level' do
+        before do
+          stub_application_setting(require_two_factor_authentication: true)
+        end
+
+        it { is_expected.to redirect_to(profile_two_factor_auth_path) }
+      end
+
+      context 'when 2fa is set up on group level' do
+        let(:user) { create(:user, require_two_factor_authentication_from_group: true) }
+
+        it { is_expected.to redirect_to(profile_two_factor_auth_path) }
+      end
+    end
+
     describe 'GET #new' do
       subject { get :new }
 
       it { is_expected.to have_gitlab_http_status(:ok) }
 
       it_behaves_like 'redirects to login page when the user is not signed in'
+      it_behaves_like 'redirects to 2fa setup page when the user requires it'
     end
 
     describe 'DELETE #destroy' do
@@ -33,6 +50,7 @@ RSpec.describe Oauth::ApplicationsController do
       it { is_expected.to redirect_to(oauth_applications_url) }
 
       it_behaves_like 'redirects to login page when the user is not signed in'
+      it_behaves_like 'redirects to 2fa setup page when the user requires it'
     end
 
     describe 'GET #edit' do
@@ -41,6 +59,7 @@ RSpec.describe Oauth::ApplicationsController do
       it { is_expected.to have_gitlab_http_status(:ok) }
 
       it_behaves_like 'redirects to login page when the user is not signed in'
+      it_behaves_like 'redirects to 2fa setup page when the user requires it'
     end
 
     describe 'PUT #update' do
@@ -49,6 +68,7 @@ RSpec.describe Oauth::ApplicationsController do
       it { is_expected.to redirect_to(oauth_application_url(application)) }
 
       it_behaves_like 'redirects to login page when the user is not signed in'
+      it_behaves_like 'redirects to 2fa setup page when the user requires it'
     end
 
     describe 'GET #show' do
@@ -57,6 +77,7 @@ RSpec.describe Oauth::ApplicationsController do
       it { is_expected.to have_gitlab_http_status(:ok) }
 
       it_behaves_like 'redirects to login page when the user is not signed in'
+      it_behaves_like 'redirects to 2fa setup page when the user requires it'
     end
 
     describe 'GET #index' do
@@ -73,6 +94,7 @@ RSpec.describe Oauth::ApplicationsController do
       end
 
       it_behaves_like 'redirects to login page when the user is not signed in'
+      it_behaves_like 'redirects to 2fa setup page when the user requires it'
     end
 
     describe 'POST #create' do
@@ -112,6 +134,7 @@ RSpec.describe Oauth::ApplicationsController do
       end
 
       it_behaves_like 'redirects to login page when the user is not signed in'
+      it_behaves_like 'redirects to 2fa setup page when the user requires it'
     end
   end
 
@@ -119,6 +142,10 @@ RSpec.describe Oauth::ApplicationsController do
     it 'current_user_mode available' do
       expect(subject.current_user_mode).not_to be_nil
     end
+
+    it 'includes Two-factor enforcement concern' do
+      expect(described_class.included_modules.include?(EnforcesTwoFactorAuthentication)).to eq(true)
+    end
   end
 
   def disable_user_oauth
diff --git a/spec/controllers/oauth/authorizations_controller_spec.rb b/spec/controllers/oauth/authorizations_controller_spec.rb
index 89b74675d28a705cf9fed39be40e4bfa804c4503..23d472f6853dc108a2697c2d949eca9bf8f0428c 100644
--- a/spec/controllers/oauth/authorizations_controller_spec.rb
+++ b/spec/controllers/oauth/authorizations_controller_spec.rb
@@ -3,6 +3,8 @@
 require 'spec_helper'
 
 RSpec.describe Oauth::AuthorizationsController do
+  let(:user) { create(:user, confirmed_at: confirmed_at) }
+  let(:confirmed_at) { 1.hour.ago }
   let!(:application) { create(:oauth_application, scopes: 'api read_user', redirect_uri: 'http://example.com') }
   let(:params) do
     {
@@ -17,9 +19,45 @@ RSpec.describe Oauth::AuthorizationsController do
     sign_in(user)
   end
 
+  shared_examples 'OAuth Authorizations require confirmed user' do
+    context 'when the user is confirmed' do
+      context 'when there is already an access token for the application with a matching scope' do
+        before do
+          scopes = Doorkeeper::OAuth::Scopes.from_string('api')
+
+          allow(Doorkeeper.configuration).to receive(:scopes).and_return(scopes)
+
+          create(:oauth_access_token, application: application, resource_owner_id: user.id, scopes: scopes)
+        end
+
+        it 'authorizes the request and redirects' do
+          subject
+
+          expect(request.session['user_return_to']).to be_nil
+          expect(response).to have_gitlab_http_status(:found)
+        end
+      end
+    end
+
+    context 'when the user is unconfirmed' do
+      let(:confirmed_at) { nil }
+
+      it 'returns 200 and renders error view' do
+        subject
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(response).to render_template('doorkeeper/authorizations/error')
+      end
+    end
+  end
+
   describe 'GET #new' do
+    subject { get :new, params: params }
+
+    include_examples 'OAuth Authorizations require confirmed user'
+
     context 'when the user is confirmed' do
-      let(:user) { create(:user) }
+      let(:confirmed_at) { 1.hour.ago }
 
       context 'without valid params' do
         it 'returns 200 code and renders error view' do
@@ -34,7 +72,7 @@ RSpec.describe Oauth::AuthorizationsController do
         render_views
 
         it 'returns 200 code and renders view' do
-          get :new, params: params
+          subject
 
           expect(response).to have_gitlab_http_status(:ok)
           expect(response).to render_template('doorkeeper/authorizations/new')
@@ -44,42 +82,28 @@ RSpec.describe Oauth::AuthorizationsController do
           application.update(trusted: true)
           request.session['user_return_to'] = 'http://example.com'
 
-          get :new, params: params
+          subject
 
           expect(request.session['user_return_to']).to be_nil
           expect(response).to have_gitlab_http_status(:found)
         end
-
-        context 'when there is already an access token for the application' do
-          context 'when the request scope matches any of the created token scopes' do
-            before do
-              scopes = Doorkeeper::OAuth::Scopes.from_string('api')
-
-              allow(Doorkeeper.configuration).to receive(:scopes).and_return(scopes)
-
-              create :oauth_access_token, application: application, resource_owner_id: user.id, scopes: scopes
-            end
-
-            it 'authorizes the request and redirects' do
-              get :new, params: params
-
-              expect(request.session['user_return_to']).to be_nil
-              expect(response).to have_gitlab_http_status(:found)
-            end
-          end
-        end
       end
     end
+  end
 
-    context 'when the user is unconfirmed' do
-      let(:user) { create(:user, confirmed_at: nil) }
+  describe 'POST #create' do
+    subject { post :create, params: params }
 
-      it 'returns 200 and renders error view' do
-        get :new, params: params
+    include_examples 'OAuth Authorizations require confirmed user'
+  end
 
-        expect(response).to have_gitlab_http_status(:ok)
-        expect(response).to render_template('doorkeeper/authorizations/error')
-      end
-    end
+  describe 'DELETE #destroy' do
+    subject { delete :destroy, params: params }
+
+    include_examples 'OAuth Authorizations require confirmed user'
+  end
+
+  it 'includes Two-factor enforcement concern' do
+    expect(described_class.included_modules.include?(EnforcesTwoFactorAuthentication)).to eq(true)
   end
 end
diff --git a/spec/controllers/oauth/authorized_applications_controller_spec.rb b/spec/controllers/oauth/authorized_applications_controller_spec.rb
index 15b2969a859605dce16898d80c1195c38e4791f4..cb047e55752f1f1f307f146d02e3a94329161659 100644
--- a/spec/controllers/oauth/authorized_applications_controller_spec.rb
+++ b/spec/controllers/oauth/authorized_applications_controller_spec.rb
@@ -18,4 +18,24 @@ RSpec.describe Oauth::AuthorizedApplicationsController do
       expect(response).to have_gitlab_http_status(:not_found)
     end
   end
+
+  describe 'DELETE #destroy' do
+    let(:application) { create(:oauth_application) }
+    let!(:grant) { create(:oauth_access_grant, resource_owner_id: user.id, application: application) }
+    let!(:access_token) { create(:oauth_access_token, resource_owner: user, application: application) }
+
+    it 'revokes both access grants and tokens' do
+      expect(grant).not_to be_revoked
+      expect(access_token).not_to be_revoked
+
+      delete :destroy, params: { id: application.id }
+
+      expect(grant.reload).to be_revoked
+      expect(access_token.reload).to be_revoked
+    end
+  end
+
+  it 'includes Two-factor enforcement concern' do
+    expect(described_class.included_modules.include?(EnforcesTwoFactorAuthentication)).to eq(true)
+  end
 end
diff --git a/spec/controllers/oauth/token_info_controller_spec.rb b/spec/controllers/oauth/token_info_controller_spec.rb
index 4658c2702ca79b39f97b0485e973c664093a7d0c..91a986db2519a61da91a995e77341dfe6a52a04a 100644
--- a/spec/controllers/oauth/token_info_controller_spec.rb
+++ b/spec/controllers/oauth/token_info_controller_spec.rb
@@ -68,4 +68,8 @@ RSpec.describe Oauth::TokenInfoController do
       end
     end
   end
+
+  it 'includes Two-factor enforcement concern' do
+    expect(described_class.included_modules.include?(EnforcesTwoFactorAuthentication)).to eq(true)
+  end
 end
diff --git a/spec/controllers/oauth/tokens_controller_spec.rb b/spec/controllers/oauth/tokens_controller_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..389153d138e2759376ff284a104a6d504704442f
--- /dev/null
+++ b/spec/controllers/oauth/tokens_controller_spec.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Oauth::TokensController do
+  it 'includes Two-factor enforcement concern' do
+    expect(described_class.included_modules.include?(EnforcesTwoFactorAuthentication)).to eq(true)
+  end
+end
diff --git a/spec/features/projects/jobs_spec.rb b/spec/features/projects/jobs_spec.rb
index e78e8989575ce2119dcdfca8812a194adf2ac7c1..f059e12465332e28d86bf054ef09223d8ca1883d 100644
--- a/spec/features/projects/jobs_spec.rb
+++ b/spec/features/projects/jobs_spec.rb
@@ -551,7 +551,7 @@ RSpec.describe 'Jobs', :clean_gitlab_redis_shared_state do
 
         it 'shows deployment message' do
           expect(page).to have_content 'This job is deployed to production'
-          expect(find('.js-environment-link')['href']).to match("environments/#{environment.id}")
+          expect(find('[data-testid="job-environment-link"]')['href']).to match("environments/#{environment.id}")
         end
 
         context 'when there is a cluster used for the deployment' do
@@ -583,7 +583,7 @@ RSpec.describe 'Jobs', :clean_gitlab_redis_shared_state do
 
         it 'shows a link for the job' do
           expect(page).to have_link environment.name
-          expect(find('.js-environment-link')['href']).to match("environments/#{environment.id}")
+          expect(find('[data-testid="job-environment-link"]')['href']).to match("environments/#{environment.id}")
         end
       end
 
@@ -593,7 +593,7 @@ RSpec.describe 'Jobs', :clean_gitlab_redis_shared_state do
         it 'shows a link to latest deployment' do
           expect(page).to have_link environment.name
           expect(page).to have_content 'This job is creating a deployment'
-          expect(find('.js-environment-link')['href']).to match("environments/#{environment.id}")
+          expect(find('[data-testid="job-environment-link"]')['href']).to match("environments/#{environment.id}")
         end
       end
     end
@@ -645,15 +645,15 @@ RSpec.describe 'Jobs', :clean_gitlab_redis_shared_state do
         end
 
         it 'renders a link to the most recent deployment' do
-          expect(find('.js-environment-link')['href']).to match("environments/#{environment.id}")
-          expect(find('.js-job-deployment-link')['href']).to include(second_deployment.deployable.project.path, second_deployment.deployable_id.to_s)
+          expect(find('[data-testid="job-environment-link"]')['href']).to match("environments/#{environment.id}")
+          expect(find('[data-testid="job-deployment-link"]')['href']).to include(second_deployment.deployable.project.path, second_deployment.deployable_id.to_s)
         end
 
         context 'when deployment does not have a deployable' do
           let!(:second_deployment) { create(:deployment, :success, environment: environment, deployable: nil) }
 
           it 'has an empty href' do
-            expect(find('.js-job-deployment-link')['href']).to be_empty
+            expect(find('[data-testid="job-deployment-link"]')['href']).to be_empty
           end
         end
       end
@@ -679,7 +679,7 @@ RSpec.describe 'Jobs', :clean_gitlab_redis_shared_state do
             expected_text = 'This job is creating a deployment to staging'
 
             expect(page).to have_css('.environment-information', text: expected_text)
-            expect(find('.js-environment-link')['href']).to match("environments/#{environment.id}")
+            expect(find('[data-testid="job-environment-link"]')['href']).to match("environments/#{environment.id}")
           end
 
           context 'when it has deployment' do
@@ -690,7 +690,7 @@ RSpec.describe 'Jobs', :clean_gitlab_redis_shared_state do
 
               expect(page).to have_css('.environment-information', text: expected_text)
               expect(page).to have_css('.environment-information', text: 'latest deployment')
-              expect(find('.js-environment-link')['href']).to match("environments/#{environment.id}")
+              expect(find('[data-testid="job-environment-link"]')['href']).to match("environments/#{environment.id}")
             end
           end
         end
@@ -705,7 +705,7 @@ RSpec.describe 'Jobs', :clean_gitlab_redis_shared_state do
               '.environment-information', text: expected_text)
             expect(page).not_to have_css(
               '.environment-information', text: 'latest deployment')
-            expect(find('.js-environment-link')['href']).to match("environments/#{environment.id}")
+            expect(find('[data-testid="job-environment-link"]')['href']).to match("environments/#{environment.id}")
           end
         end
       end
diff --git a/spec/frontend/jobs/components/environments_block_spec.js b/spec/frontend/jobs/components/environments_block_spec.js
index 4f2359e83b6f8a81a0d0670ed0db6764ef84851f..d90c9137a8fc69a3ce9f6c83149748cc550d3841 100644
--- a/spec/frontend/jobs/components/environments_block_spec.js
+++ b/spec/frontend/jobs/components/environments_block_spec.js
@@ -1,14 +1,13 @@
-import Vue from 'vue';
-import component from '~/jobs/components/environments_block.vue';
-import mountComponent from '../../helpers/vue_mount_component_helper';
+import { mount } from '@vue/test-utils';
+import EnvironmentsBlock from '~/jobs/components/environments_block.vue';
 
 const TEST_CLUSTER_NAME = 'test_cluster';
 const TEST_CLUSTER_PATH = 'path/to/test_cluster';
 const TEST_KUBERNETES_NAMESPACE = 'this-is-a-kubernetes-namespace';
 
 describe('Environments block', () => {
-  const Component = Vue.extend(component);
-  let vm;
+  let wrapper;
+
   const status = {
     group: 'success',
     icon: 'status_success',
@@ -38,20 +37,23 @@ describe('Environments block', () => {
   });
 
   const createComponent = (deploymentStatus = {}, deploymentCluster = {}) => {
-    vm = mountComponent(Component, {
-      deploymentStatus,
-      deploymentCluster,
-      iconStatus: status,
+    wrapper = mount(EnvironmentsBlock, {
+      propsData: {
+        deploymentStatus,
+        deploymentCluster,
+        iconStatus: status,
+      },
     });
   };
 
-  const findText = () => vm.$el.textContent.trim();
-  const findJobDeploymentLink = () => vm.$el.querySelector('.js-job-deployment-link');
-  const findEnvironmentLink = () => vm.$el.querySelector('.js-environment-link');
-  const findClusterLink = () => vm.$el.querySelector('.js-job-cluster-link');
+  const findText = () => wrapper.find(EnvironmentsBlock).text();
+  const findJobDeploymentLink = () => wrapper.find('[data-testid="job-deployment-link"]');
+  const findEnvironmentLink = () => wrapper.find('[data-testid="job-environment-link"]');
+  const findClusterLink = () => wrapper.find('[data-testid="job-cluster-link"]');
 
   afterEach(() => {
-    vm.$destroy();
+    wrapper.destroy();
+    wrapper = null;
   });
 
   describe('with last deployment', () => {
@@ -61,7 +63,7 @@ describe('Environments block', () => {
         environment,
       });
 
-      expect(findText()).toEqual('This job is deployed to environment.');
+      expect(findText()).toBe('This job is deployed to environment.');
     });
 
     describe('when there is a cluster', () => {
@@ -74,7 +76,7 @@ describe('Environments block', () => {
           createDeploymentWithCluster(),
         );
 
-        expect(findText()).toEqual(
+        expect(findText()).toBe(
           `This job is deployed to environment using cluster ${TEST_CLUSTER_NAME}.`,
         );
       });
@@ -89,7 +91,7 @@ describe('Environments block', () => {
             createDeploymentWithClusterAndKubernetesNamespace(),
           );
 
-          expect(findText()).toEqual(
+          expect(findText()).toBe(
             `This job is deployed to environment using cluster ${TEST_CLUSTER_NAME} and namespace ${TEST_KUBERNETES_NAMESPACE}.`,
           );
         });
@@ -105,11 +107,11 @@ describe('Environments block', () => {
           environment: createEnvironmentWithLastDeployment(),
         });
 
-        expect(findText()).toEqual(
+        expect(findText()).toBe(
           'This job is an out-of-date deployment to environment. View the most recent deployment.',
         );
 
-        expect(findJobDeploymentLink().getAttribute('href')).toEqual('bar');
+        expect(findJobDeploymentLink().attributes('href')).toBe('bar');
       });
 
       describe('when there is a cluster', () => {
@@ -122,7 +124,7 @@ describe('Environments block', () => {
             createDeploymentWithCluster(),
           );
 
-          expect(findText()).toEqual(
+          expect(findText()).toBe(
             `This job is an out-of-date deployment to environment using cluster ${TEST_CLUSTER_NAME}. View the most recent deployment.`,
           );
         });
@@ -137,7 +139,7 @@ describe('Environments block', () => {
               createDeploymentWithClusterAndKubernetesNamespace(),
             );
 
-            expect(findText()).toEqual(
+            expect(findText()).toBe(
               `This job is an out-of-date deployment to environment using cluster ${TEST_CLUSTER_NAME} and namespace ${TEST_KUBERNETES_NAMESPACE}. View the most recent deployment.`,
             );
           });
@@ -152,7 +154,7 @@ describe('Environments block', () => {
           environment,
         });
 
-        expect(findText()).toEqual('This job is an out-of-date deployment to environment.');
+        expect(findText()).toBe('This job is an out-of-date deployment to environment.');
       });
     });
   });
@@ -164,7 +166,7 @@ describe('Environments block', () => {
         environment,
       });
 
-      expect(findText()).toEqual('The deployment of this job to environment did not succeed.');
+      expect(findText()).toBe('The deployment of this job to environment did not succeed.');
     });
   });
 
@@ -176,13 +178,15 @@ describe('Environments block', () => {
           environment: createEnvironmentWithLastDeployment(),
         });
 
-        expect(findText()).toEqual(
+        expect(findText()).toBe(
           'This job is creating a deployment to environment. This will overwrite the latest deployment.',
         );
 
-        expect(findJobDeploymentLink().getAttribute('href')).toEqual('bar');
-        expect(findEnvironmentLink().getAttribute('href')).toEqual(environment.environment_path);
-        expect(findClusterLink()).toBeNull();
+        expect(findEnvironmentLink().attributes('href')).toBe(environment.environment_path);
+
+        expect(findJobDeploymentLink().attributes('href')).toBe('bar');
+
+        expect(findClusterLink().exists()).toBe(false);
       });
     });
 
@@ -193,7 +197,7 @@ describe('Environments block', () => {
           environment,
         });
 
-        expect(findText()).toEqual('This job is creating a deployment to environment.');
+        expect(findText()).toBe('This job is creating a deployment to environment.');
       });
 
       describe('when there is a cluster', () => {
@@ -206,7 +210,7 @@ describe('Environments block', () => {
             createDeploymentWithCluster(),
           );
 
-          expect(findText()).toEqual(
+          expect(findText()).toBe(
             `This job is creating a deployment to environment using cluster ${TEST_CLUSTER_NAME}.`,
           );
         });
@@ -220,7 +224,7 @@ describe('Environments block', () => {
           environment: null,
         });
 
-        expect(findEnvironmentLink()).toBeNull();
+        expect(findEnvironmentLink().exists()).toBe(false);
       });
     });
   });
@@ -235,11 +239,11 @@ describe('Environments block', () => {
         createDeploymentWithCluster(),
       );
 
-      expect(findText()).toEqual(
+      expect(findText()).toBe(
         `This job is deployed to environment using cluster ${TEST_CLUSTER_NAME}.`,
       );
 
-      expect(findClusterLink().getAttribute('href')).toEqual(TEST_CLUSTER_PATH);
+      expect(findClusterLink().attributes('href')).toBe(TEST_CLUSTER_PATH);
     });
 
     describe('when the cluster is missing the path', () => {
@@ -254,7 +258,7 @@ describe('Environments block', () => {
 
         expect(findText()).toContain('using cluster the-cluster.');
 
-        expect(findClusterLink()).toBeNull();
+        expect(findClusterLink().exists()).toBe(false);
       });
     });
   });
diff --git a/spec/helpers/issuables_helper_spec.rb b/spec/helpers/issuables_helper_spec.rb
index 38ad11846d2a19a78ba6c0c1c28f3469656824e6..d592caf2505241e5e93a6334e80592eaef65ff14 100644
--- a/spec/helpers/issuables_helper_spec.rb
+++ b/spec/helpers/issuables_helper_spec.rb
@@ -303,4 +303,12 @@ describe IssuablesHelper do
       end
     end
   end
+
+  describe '#sidebar_milestone_tooltip_label' do
+    it 'escapes HTML in the milestone title' do
+      milestone = build(:milestone, title: '&lt;img onerror=alert(1)&gt;')
+
+      expect(helper.sidebar_milestone_tooltip_label(milestone)).to eq('&lt;img onerror=alert(1)&gt;<br/>Milestone')
+    end
+  end
 end
diff --git a/spec/lib/banzai/filter/issue_reference_filter_spec.rb b/spec/lib/banzai/filter/issue_reference_filter_spec.rb
index 603da2b4421ba46bee7cf388bd2754ceab8ad5de..02c7e214b26ada6262c9c70950f8561933f083d0 100644
--- a/spec/lib/banzai/filter/issue_reference_filter_spec.rb
+++ b/spec/lib/banzai/filter/issue_reference_filter_spec.rb
@@ -75,6 +75,12 @@ describe Banzai::Filter::IssueReferenceFilter do
       expect(doc.text).to eq "Issue #{reference}"
     end
 
+    it 'renders non-HTML tooltips' do
+      doc = reference_filter("Issue #{reference}")
+
+      expect(doc.at_css('a')).not_to have_attribute('data-html')
+    end
+
     it 'includes default classes' do
       doc = reference_filter("Issue #{reference}")
       expect(doc.css('a').first.attr('class')).to eq 'gfm gfm-issue has-tooltip'
diff --git a/spec/lib/gitlab/checks/branch_check_spec.rb b/spec/lib/gitlab/checks/branch_check_spec.rb
index fd7eaa1603f5e91c78c87bb7097d402a6af65a0d..6a4318b93f0da95fe4107712d1e1456173808721 100644
--- a/spec/lib/gitlab/checks/branch_check_spec.rb
+++ b/spec/lib/gitlab/checks/branch_check_spec.rb
@@ -19,6 +19,29 @@ describe Gitlab::Checks::BranchCheck do
       end
     end
 
+    context "prohibited branches check" do
+      it "prohibits 40-character hexadecimal branch names" do
+        allow(subject).to receive(:branch_name).and_return("267208abfe40e546f5e847444276f7d43a39503e")
+
+        expect { subject.validate! }.to raise_error(Gitlab::GitAccess::ForbiddenError, "You cannot create a branch with a 40-character hexadecimal branch name.")
+      end
+
+      it "doesn't prohibit a nested hexadecimal in a branch name" do
+        allow(subject).to receive(:branch_name).and_return("fix-267208abfe40e546f5e847444276f7d43a39503e")
+
+        expect { subject.validate! }.not_to raise_error
+      end
+
+      context "the feature flag is disabled" do
+        it "doesn't prohibit a 40-character hexadecimal branch name" do
+          stub_feature_flags(prohibit_hexadecimal_branch_names: false)
+          allow(subject).to receive(:branch_name).and_return("267208abfe40e546f5e847444276f7d43a39503e")
+
+          expect { subject.validate! }.not_to raise_error
+        end
+      end
+    end
+
     context 'protected branches check' do
       before do
         allow(ProtectedBranch).to receive(:protected?).with(project, 'master').and_return(true)
diff --git a/spec/lib/gitlab/import_export/decompressed_archive_size_validator_spec.rb b/spec/lib/gitlab/import_export/decompressed_archive_size_validator_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..302d11896c991eacf4abc9a0cca94c96982d8cd9
--- /dev/null
+++ b/spec/lib/gitlab/import_export/decompressed_archive_size_validator_spec.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::ImportExport::DecompressedArchiveSizeValidator do
+  let_it_be(:filepath) { File.join(Dir.tmpdir, 'decompressed_archive_size_validator_spec.gz') }
+
+  before(:all) do
+    create_compressed_file
+  end
+
+  after(:all) do
+    FileUtils.rm(filepath)
+  end
+
+  subject { described_class.new(archive_path: filepath, max_bytes: max_bytes) }
+
+  describe '#valid?' do
+    let(:max_bytes) { 1 }
+
+    context 'when file does not exceed allowed decompressed size' do
+      let(:max_bytes) { 20 }
+
+      it 'returns true' do
+        expect(subject.valid?).to eq(true)
+      end
+    end
+
+    context 'when file exceeds allowed decompressed size' do
+      it 'returns false' do
+        expect(subject.valid?).to eq(false)
+      end
+    end
+
+    context 'when something goes wrong during decompression' do
+      before do
+        allow(subject.archive_file).to receive(:eof?).and_raise(StandardError)
+      end
+
+      it 'logs and tracks raised exception' do
+        expect(Gitlab::ErrorTracking).to receive(:track_exception).with(instance_of(StandardError))
+        expect(Gitlab::Import::Logger).to receive(:info).with(hash_including(message: 'Decompressed archive size validation failed.'))
+
+        subject.valid?
+      end
+
+      it 'returns false' do
+        expect(subject.valid?).to eq(false)
+      end
+    end
+  end
+
+  def create_compressed_file
+    Zlib::GzipWriter.open(filepath) do |gz|
+      gz.write('Hello World!')
+    end
+  end
+end
diff --git a/spec/lib/gitlab/import_export/file_importer_spec.rb b/spec/lib/gitlab/import_export/file_importer_spec.rb
index 7c54c5f2da14ee102da04146fd13c47c2228ee34..870fe8bc7fc05ab371a40d4cc5855ab24220ab39 100644
--- a/spec/lib/gitlab/import_export/file_importer_spec.rb
+++ b/spec/lib/gitlab/import_export/file_importer_spec.rb
@@ -98,6 +98,45 @@ describe Gitlab::ImportExport::FileImporter do
     end
   end
 
+  context 'when file exceeds acceptable decompressed size' do
+    let(:project) { create(:project) }
+    let(:shared) { Gitlab::ImportExport::Shared.new(project) }
+    let(:filepath) { File.join(Dir.tmpdir, 'file_importer_spec.gz') }
+
+    subject { described_class.new(importable: project, archive_file: filepath, shared: shared) }
+
+    before do
+      Zlib::GzipWriter.open(filepath) do |gz|
+        gz.write('Hello World!')
+      end
+    end
+
+    context 'when validate_import_decompressed_archive_size feature flag is enabled' do
+      before do
+        stub_feature_flags(validate_import_decompressed_archive_size: true)
+
+        allow(Gitlab::ImportExport::DecompressedArchiveSizeValidator).to receive(:max_bytes).and_return(1)
+      end
+
+      it 'returns false' do
+        expect(subject.import).to eq(false)
+        expect(shared.errors.join).to eq('Decompressed archive size validation failed.')
+      end
+    end
+
+    context 'when validate_import_decompressed_archive_size feature flag is disabled' do
+      before do
+        stub_feature_flags(validate_import_decompressed_archive_size: false)
+      end
+
+      it 'skips validation' do
+        expect(subject).to receive(:validate_decompressed_archive_size).never
+
+        subject.import
+      end
+    end
+  end
+
   def setup_files
     FileUtils.mkdir_p("#{shared.export_path}/subfolder/")
     FileUtils.touch(valid_file)
diff --git a/spec/mailers/notify_spec.rb b/spec/mailers/notify_spec.rb
index 8b99cc41a53fa3bb582161aa78498a456c31343d..826b0b047b1c60a826b7730de492916807da0b29 100644
--- a/spec/mailers/notify_spec.rb
+++ b/spec/mailers/notify_spec.rb
@@ -45,6 +45,21 @@ describe Notify do
     end
   end
 
+  shared_examples 'it requires a group' do
+    context 'when given an deleted group' do
+      before do
+        # destroy group and group member
+        group_member.destroy!
+        group.destroy!
+      end
+
+      it 'returns NullMail type message' do
+        expect(Gitlab::AppLogger).to receive(:info)
+        expect(subject.message).to be_a(ActionMailer::Base::NullMail)
+      end
+    end
+  end
+
   context 'for a project' do
     shared_examples 'an assignee email' do
       let(:recipient) { assignee }
@@ -1313,6 +1328,7 @@ describe Notify do
       it_behaves_like "a user cannot unsubscribe through footer link"
       it_behaves_like 'appearance header and footer enabled'
       it_behaves_like 'appearance header and footer not enabled'
+      it_behaves_like 'it requires a group'
 
       it 'contains all the useful information' do
         is_expected.to have_subject "Access to the #{group.name} group was granted"
@@ -1347,6 +1363,7 @@ describe Notify do
       it_behaves_like "a user cannot unsubscribe through footer link"
       it_behaves_like 'appearance header and footer enabled'
       it_behaves_like 'appearance header and footer not enabled'
+      it_behaves_like 'it requires a group'
 
       it 'contains all the useful information' do
         is_expected.to have_subject "Invitation to join the #{group.name} group"
@@ -1373,6 +1390,7 @@ describe Notify do
       it_behaves_like "a user cannot unsubscribe through footer link"
       it_behaves_like 'appearance header and footer enabled'
       it_behaves_like 'appearance header and footer not enabled'
+      it_behaves_like 'it requires a group'
 
       it 'contains all the useful information' do
         is_expected.to have_subject 'Invitation accepted'
diff --git a/spec/services/groups/transfer_service_spec.rb b/spec/services/groups/transfer_service_spec.rb
index d7f6bececfe9d44bd6013de83088a6d4993cd2b7..25bfe2e8c8283ca2397abfd9dc33de1283ccc933 100644
--- a/spec/services/groups/transfer_service_spec.rb
+++ b/spec/services/groups/transfer_service_spec.rb
@@ -346,44 +346,117 @@ describe Groups::TransferService do
       end
 
       context 'when transferring a group with nested groups and projects' do
-        let!(:group) { create(:group, :public) }
+        let(:subgroup1) { create(:group, :private, parent: group) }
         let!(:project1) { create(:project, :repository, :private, namespace: group) }
-        let!(:subgroup1) { create(:group, :private, parent: group) }
         let!(:nested_subgroup) { create(:group, :private, parent: subgroup1) }
         let!(:nested_project) { create(:project, :repository, :private, namespace: subgroup1) }
 
         before do
           TestEnv.clean_test_path
           create(:group_member, :owner, group: new_parent_group, user: user)
-          transfer_service.execute(new_parent_group)
         end
 
-        it 'updates subgroups path' do
-          new_base_path = "#{new_parent_group.path}/#{group.path}"
-          group.children.each do |children|
-            expect(children.full_path).to eq("#{new_base_path}/#{children.path}")
+        context 'updated paths' do
+          let(:group) { create(:group, :public) }
+
+          before do
+            transfer_service.execute(new_parent_group)
           end
 
-          new_base_path = "#{new_parent_group.path}/#{group.path}/#{subgroup1.path}"
-          subgroup1.children.each do |children|
-            expect(children.full_path).to eq("#{new_base_path}/#{children.path}")
+          it 'updates subgroups path' do
+            new_base_path = "#{new_parent_group.path}/#{group.path}"
+            group.children.each do |children|
+              expect(children.full_path).to eq("#{new_base_path}/#{children.path}")
+            end
+
+            new_base_path = "#{new_parent_group.path}/#{group.path}/#{subgroup1.path}"
+            subgroup1.children.each do |children|
+              expect(children.full_path).to eq("#{new_base_path}/#{children.path}")
+            end
           end
-        end
 
-        it 'updates projects path' do
-          new_parent_path = "#{new_parent_group.path}/#{group.path}"
-          subgroup1.projects.each do |project|
-            project_full_path = "#{new_parent_path}/#{project.namespace.path}/#{project.name}"
-            expect(project.full_path).to eq(project_full_path)
+          it 'updates projects path' do
+            new_parent_path = "#{new_parent_group.path}/#{group.path}"
+            subgroup1.projects.each do |project|
+              project_full_path = "#{new_parent_path}/#{project.namespace.path}/#{project.name}"
+              expect(project.full_path).to eq(project_full_path)
+            end
+          end
+
+          it 'creates redirect for the subgroups and projects' do
+            expect(group.redirect_routes.count).to eq(1)
+            expect(project1.redirect_routes.count).to eq(1)
+            expect(subgroup1.redirect_routes.count).to eq(1)
+            expect(nested_subgroup.redirect_routes.count).to eq(1)
+            expect(nested_project.redirect_routes.count).to eq(1)
           end
         end
 
-        it 'creates redirect for the subgroups and projects' do
-          expect(group.redirect_routes.count).to eq(1)
-          expect(project1.redirect_routes.count).to eq(1)
-          expect(subgroup1.redirect_routes.count).to eq(1)
-          expect(nested_subgroup.redirect_routes.count).to eq(1)
-          expect(nested_project.redirect_routes.count).to eq(1)
+        context 'resets project authorizations' do
+          let(:old_parent_group) { create(:group) }
+          let(:group) { create(:group, :private, parent: old_parent_group) }
+          let(:new_group_member) { create(:user) }
+          let(:old_group_member) { create(:user) }
+
+          before do
+            new_parent_group.add_maintainer(new_group_member)
+            old_parent_group.add_maintainer(old_group_member)
+            group.refresh_members_authorized_projects
+          end
+
+          it 'removes old project authorizations' do
+            expect { transfer_service.execute(new_parent_group) }.to change {
+              ProjectAuthorization.where(project_id: project1.id, user_id: old_group_member.id).size
+            }.from(1).to(0)
+          end
+
+          it 'adds new project authorizations' do
+            expect { transfer_service.execute(new_parent_group) }.to change {
+              ProjectAuthorization.where(project_id: project1.id, user_id: new_group_member.id).size
+            }.from(0).to(1)
+          end
+
+          it 'performs authorizations job immediately' do
+            expect(AuthorizedProjectsWorker).to receive(:bulk_perform_inline)
+
+            transfer_service.execute(new_parent_group)
+          end
+
+          context 'for nested projects' do
+            it 'removes old project authorizations' do
+              expect { transfer_service.execute(new_parent_group) }.to change {
+                ProjectAuthorization.where(project_id: nested_project.id, user_id: old_group_member.id).size
+              }.from(1).to(0)
+            end
+
+            it 'adds new project authorizations' do
+              expect { transfer_service.execute(new_parent_group) }.to change {
+                ProjectAuthorization.where(project_id: nested_project.id, user_id: new_group_member.id).size
+              }.from(0).to(1)
+            end
+          end
+
+          context 'for groups with many members' do
+            before do
+              11.times do
+                new_parent_group.add_maintainer(create(:user))
+              end
+            end
+
+            it 'adds new project authorizations for the user which makes a transfer' do
+              transfer_service.execute(new_parent_group)
+
+              expect(ProjectAuthorization.where(project_id: project1.id, user_id: user.id).size).to eq(1)
+              expect(ProjectAuthorization.where(project_id: nested_project.id, user_id: user.id).size).to eq(1)
+            end
+
+            it 'schedules authorizations job' do
+              expect(AuthorizedProjectsWorker).to receive(:bulk_perform_async)
+                .with(array_including(new_parent_group.members_with_parents.pluck(:user_id).map {|id| [id, anything] }))
+
+              transfer_service.execute(new_parent_group)
+            end
+          end
         end
       end