[SECURITY-1525]

test/src/test/java/lib/form/ComboBoxSEC1525Test.java

+package lib.form;
+
+import com.gargoylesoftware.htmlunit.html.HtmlElement;
+import com.gargoylesoftware.htmlunit.html.HtmlElementUtil;
+import com.gargoylesoftware.htmlunit.html.HtmlPage;
+import hudson.model.FreeStyleProject;
+import hudson.model.Job;
+import hudson.util.ComboBoxModel;
+import jenkins.model.OptionalJobProperty;
+import org.jvnet.hudson.test.HudsonTestCase;
+import org.jvnet.hudson.test.Issue;
+import org.jvnet.hudson.test.TestExtension;
+
+//TODO meant to be merged back into ComboBoxTest after security release to avoid conflict during the upmerge process
+public class ComboBoxSEC1525Test extends HudsonTestCase {
+    public static class XssProperty extends OptionalJobProperty<Job<?,?>> {
+        @TestExtension("testEnsureXSSnotPossible")
+        public static class DescriptorImpl extends OptionalJobProperty.OptionalJobPropertyDescriptor {
+
+            @Override
+            public String getDisplayName() {
+                return "XSS Property";
+            }
+            
+            public ComboBoxModel doFillXssItems() {
+                return new ComboBoxModel("<h1>HACK</h1>");
+            }
+        }
+    }
+
+    @Issue("SECURITY-1525")
+    public void testEnsureXSSnotPossible() throws Exception {
+        XssProperty xssProperty = new XssProperty();
+        FreeStyleProject p = createFreeStyleProject();
+        p.addProperty(xssProperty);
+
+        WebClient wc = new WebClient();
+
+        HtmlPage configurePage = wc.getPage(p, "configure");
+        int numberOfH1Before = configurePage.getElementsByTagName("h1").size();
+
+        HtmlElement comboBox = configurePage.getElementByName("_.xss");
+        HtmlElementUtil.click(comboBox);
+
+        // no additional h1, meaning the "payload" is not interpreted
+        int numberOfH1After = configurePage.getElementsByTagName("h1").size();
+
+        assertEquals(numberOfH1Before, numberOfH1After);
+    }
+}

test/src/test/resources/lib/form/ComboBoxSEC1525Test/XssProperty/config.jelly

+<?jelly escape-by-default='true'?>
+<j:jelly xmlns:j="jelly:core" xmlns:f="/lib/form">
+	<f:entry field="xss">
+	  <f:combobox />
+	</f:entry>
+</j:jelly>

war/src/main/webapp/scripts/combobox.js

@@ -246,7 +246,7 @@ ComboBox.prototype.populateDropdown = function() {
 		for (var i = 0; i < this.availableItems.length; i++) {
 			var item = document.createElement("div");
 			item.className = "comboBoxItem";
-			item.innerHTML = this.availableItems[i];
+			item.innerText = this.availableItems[i];
 			item.id = "item_" + this.availableItems[i];
 			item.comboBox = this;
 			item.comboBoxIndex = i;