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bitstorm pushed a commit to branch wicket-8.x
in repository https://gitbox.apache.org/repos/asf/wicket.git


The following commit(s) were added to refs/heads/wicket-8.x by this push:
     new 21a938e00b Wicket 8.x security fixes (#1451)
21a938e00b is described below

commit 21a938e00b2cf4643ef845aa766bd4bec62304fd
Author: pedrosans <[email protected]>
AuthorDate: Sat May 9 14:07:19 2026 -0300

    Wicket 8.x security fixes (#1451)
    
    * Changing session id after binding.
    
    * Added JS sanitazing and and fix for PackageResource
    
    ---------
    
    Co-authored-by: Andrea Del Bene <[email protected]>
---
 .../authentication/AuthenticatedWebSession.java    |   1 +
 .../wicket/core/util/string/JavaScriptUtils.java   |  20 +++
 .../wicket/markup/html/link/ExternalLink.java      |   3 +-
 .../org/apache/wicket/markup/html/link/Link.java   |   2 +-
 .../wicket/markup/html/link/PopupSettings.java     |   7 +-
 .../wicket/request/resource/PackageResource.java   |  54 +++------
 .../core/util/string/JavaScriptUtilsTest.java      |   8 ++
 .../wicket/markup/html/PackageResourceTest.java    |  58 ++++++++-
 .../markup/html/link/ClientSideImageMapTest.java   |  76 ++++++------
 .../wicket/markup/html/link/ExternalLinkTest.java  | 135 +++++++++++++--------
 .../snake_case/TestPageInsideSnakeCasePackage.html |  11 ++
 .../TestPageInsideSnakeCasePackage.java}           |  61 ++++------
 .../apache/wicket/markup/html/snake_case/style.css |   0
 .../autocomplete/AbstractAutoCompleteRenderer.java |   3 +-
 .../AbstractAutoCompleteRendererTest.java          |  65 ++++++++++
 15 files changed, 334 insertions(+), 170 deletions(-)

diff --git 
a/wicket-auth-roles/src/main/java/org/apache/wicket/authroles/authentication/AuthenticatedWebSession.java
 
b/wicket-auth-roles/src/main/java/org/apache/wicket/authroles/authentication/AuthenticatedWebSession.java
index 3fa0aad982..b0f1df7c9a 100644
--- 
a/wicket-auth-roles/src/main/java/org/apache/wicket/authroles/authentication/AuthenticatedWebSession.java
+++ 
b/wicket-auth-roles/src/main/java/org/apache/wicket/authroles/authentication/AuthenticatedWebSession.java
@@ -71,6 +71,7 @@ public abstract class AuthenticatedWebSession extends 
AbstractAuthenticatedWebSe
                }
                else if (authenticated && signedIn.compareAndSet(false, true))
                {
+                       changeSessionId();
                        bind();
                }
                return authenticated;
diff --git 
a/wicket-core/src/main/java/org/apache/wicket/core/util/string/JavaScriptUtils.java
 
b/wicket-core/src/main/java/org/apache/wicket/core/util/string/JavaScriptUtils.java
index 8e4d042cd1..03a30bb62a 100644
--- 
a/wicket-core/src/main/java/org/apache/wicket/core/util/string/JavaScriptUtils.java
+++ 
b/wicket-core/src/main/java/org/apache/wicket/core/util/string/JavaScriptUtils.java
@@ -95,6 +95,26 @@ public class JavaScriptUtils
                return s;
        }
 
+       /**
+        * Escape single and double quotes so that they can be part of e.g. an 
alert call.
+        *
+        * Note: JSON values need to escape only the double quote, so this 
method wont help.
+        *
+        * @param input
+        *            the JavaScript which needs to be escaped
+        * @return Escaped version of the input
+        */
+       public static CharSequence escapeQuotesAndBackslash(final CharSequence 
input)
+       {
+               CharSequence s = input;
+               if (s != null)
+               {
+                       s = Strings.replaceAll(s, "\\", "\\\\");
+                       s = escapeQuotes(s);
+               }
+               return s;
+       }
+
        /**
         * Write a reference to a javascript file to the response object
         * 
diff --git 
a/wicket-core/src/main/java/org/apache/wicket/markup/html/link/ExternalLink.java
 
b/wicket-core/src/main/java/org/apache/wicket/markup/html/link/ExternalLink.java
index e37799bab7..6526c38b72 100644
--- 
a/wicket-core/src/main/java/org/apache/wicket/markup/html/link/ExternalLink.java
+++ 
b/wicket-core/src/main/java/org/apache/wicket/markup/html/link/ExternalLink.java
@@ -16,6 +16,7 @@
  */
 package org.apache.wicket.markup.html.link;
 
+import org.apache.wicket.core.util.string.JavaScriptUtils;
 import org.apache.wicket.markup.ComponentTag;
 import org.apache.wicket.model.IModel;
 import org.apache.wicket.model.Model;
@@ -193,7 +194,7 @@ public class ExternalLink extends AbstractLink
                                        // generate a popup script by asking 
popup settings for one
                                        if (popupSettings != null)
                                        {
-                                               popupSettings.setTarget("'" + 
url + "'");
+                                               popupSettings.setTarget(url);
                                                String popupScript = 
popupSettings.getPopupJavaScript();
                                                tag.put("onclick", popupScript);
                                        }
diff --git 
a/wicket-core/src/main/java/org/apache/wicket/markup/html/link/Link.java 
b/wicket-core/src/main/java/org/apache/wicket/markup/html/link/Link.java
index b7b303ccb7..fd2816efd5 100644
--- a/wicket-core/src/main/java/org/apache/wicket/markup/html/link/Link.java
+++ b/wicket-core/src/main/java/org/apache/wicket/markup/html/link/Link.java
@@ -385,7 +385,7 @@ public abstract class Link<T> extends AbstractLink 
implements IRequestListener,
                                // generate a popup script by asking popup 
settings for one
                                if (popupSettings != null)
                                {
-                                       popupSettings.setTarget("'" + url + 
"'");
+                                       popupSettings.setTarget(url.toString());
                                        String popupScript = 
popupSettings.getPopupJavaScript();
                                        tag.put("onclick", popupScript);
                                }
diff --git 
a/wicket-core/src/main/java/org/apache/wicket/markup/html/link/PopupSettings.java
 
b/wicket-core/src/main/java/org/apache/wicket/markup/html/link/PopupSettings.java
index 82dc08f82f..e62b3e01be 100644
--- 
a/wicket-core/src/main/java/org/apache/wicket/markup/html/link/PopupSettings.java
+++ 
b/wicket-core/src/main/java/org/apache/wicket/markup/html/link/PopupSettings.java
@@ -16,6 +16,7 @@
  */
 package org.apache.wicket.markup.html.link;
 
+import org.apache.wicket.core.util.string.JavaScriptUtils;
 import org.apache.wicket.util.io.IClusterable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -155,8 +156,10 @@ public class PopupSettings implements IClusterable
                        windowTitle = windowTitle.replaceAll("\\W", "_");
                }
 
-           StringBuilder script = new StringBuilder("var w = window.open(" + 
target + ", '").append(
-                       windowTitle).append("', '");
+               StringBuilder script = new StringBuilder(//
+                       "var w = window.open('"//
+                               + JavaScriptUtils.escapeQuotes(target) //
+                               + "', '").append(windowTitle).append("', '");
 
                script.append("scrollbars=").append(flagToString(SCROLLBARS));
                script.append(",location=").append(flagToString(LOCATION_BAR));
diff --git 
a/wicket-core/src/main/java/org/apache/wicket/request/resource/PackageResource.java
 
b/wicket-core/src/main/java/org/apache/wicket/request/resource/PackageResource.java
index e1ace3a127..78bb33d75c 100644
--- 
a/wicket-core/src/main/java/org/apache/wicket/request/resource/PackageResource.java
+++ 
b/wicket-core/src/main/java/org/apache/wicket/request/resource/PackageResource.java
@@ -16,17 +16,6 @@
  */
 package org.apache.wicket.request.resource;
 
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.Serializable;
-import java.nio.charset.Charset;
-import java.nio.charset.StandardCharsets;
-import java.util.Locale;
-import java.util.Objects;
-
-import javax.servlet.http.HttpServletResponse;
-
 import org.apache.wicket.Application;
 import org.apache.wicket.IWicketInternalException;
 import org.apache.wicket.Session;
@@ -46,7 +35,6 @@ import org.apache.wicket.response.StringResponse;
 import org.apache.wicket.util.io.IOUtils;
 import org.apache.wicket.util.lang.Classes;
 import org.apache.wicket.util.lang.Packages;
-import org.apache.wicket.util.resource.IFixedLocationResourceStream;
 import org.apache.wicket.util.resource.IResourceStream;
 import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
 import org.apache.wicket.util.resource.ResourceStreamWrapper;
@@ -55,6 +43,16 @@ import org.apache.wicket.util.time.Time;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import javax.servlet.http.HttpServletResponse;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Serializable;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.Locale;
+import java.util.Objects;
+
 /**
  * Represents a localizable static resource.
  * <p>
@@ -557,38 +555,18 @@ public class PackageResource extends AbstractResource 
implements IStaticCacheabl
 
        private IResourceStream internalGetResourceStream(final String style, 
final Locale locale)
        {
+               if (!accept(absolutePath))
+               {
+                       throw new PackageResourceBlockedException(
+                               "Access denied to (static) package resource " + 
absolutePath + ". See IPackageResourceGuard");
+               }
+
                IResourceStreamLocator resourceStreamLocator = Application.get()
                        .getResourceSettings()
                        .getResourceStreamLocator();
                IResourceStream resourceStream = 
resourceStreamLocator.locate(getScope(), absolutePath,
                        style, variation, locale, null, false);
 
-               String realPath = absolutePath;
-               if (resourceStream instanceof IFixedLocationResourceStream)
-               {
-                       realPath = 
((IFixedLocationResourceStream)resourceStream).locationAsString();
-                       if (realPath != null)
-                       {
-                               int index = realPath.indexOf(absolutePath);
-                               if (index != -1)
-                               {
-                                       realPath = realPath.substring(index);
-                               }
-                       }
-                       else
-                       {
-                               realPath = absolutePath;
-                       }
-
-               }
-
-               if (accept(realPath) == false)
-               {
-                       throw new PackageResourceBlockedException(
-                               "Access denied to (static) package resource " + 
absolutePath +
-                                       ". See IPackageResourceGuard");
-               }
-
                if (resourceStream != null)
                {
                        resourceStream = new 
ProcessingResourceStream(resourceStream);
diff --git 
a/wicket-core/src/test/java/org/apache/wicket/core/util/string/JavaScriptUtilsTest.java
 
b/wicket-core/src/test/java/org/apache/wicket/core/util/string/JavaScriptUtilsTest.java
index 1c7f5c499a..33b29b1d7b 100644
--- 
a/wicket-core/src/test/java/org/apache/wicket/core/util/string/JavaScriptUtilsTest.java
+++ 
b/wicket-core/src/test/java/org/apache/wicket/core/util/string/JavaScriptUtilsTest.java
@@ -17,9 +17,12 @@
 package org.apache.wicket.core.util.string;
 
 import org.apache.wicket.response.StringResponse;
+import org.hamcrest.CoreMatchers;
 import org.junit.Assert;
 import org.junit.Test;
 
+import static org.hamcrest.CoreMatchers.is;
+
 /**
  * @since 1.5.7
  */
@@ -89,4 +92,9 @@ public class JavaScriptUtilsTest extends Assert
                        JavaScriptUtils.SCRIPT_OPEN_TAG);
                assertEquals("\n/*]]>*/\n</script>\n", 
JavaScriptUtils.SCRIPT_CLOSE_TAG);
        }
+
+       @Test
+       public void escapeQuotesAndBackslash(){
+               
assertThat(JavaScriptUtils.escapeQuotesAndBackslash("alert('foo\\tbar')"), 
is("alert(\\'foo\\\\tbar\\')"));
+       }
 }
diff --git 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/PackageResourceTest.java
 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/PackageResourceTest.java
index 63d6b6a25b..8d5fc14031 100644
--- 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/PackageResourceTest.java
+++ 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/PackageResourceTest.java
@@ -16,11 +16,11 @@
  */
 package org.apache.wicket.markup.html;
 
-import java.util.Locale;
-
 import org.apache.wicket.Application;
 import org.apache.wicket.SharedResources;
+import org.apache.wicket.markup.html.snake_case.TestPageInsideSnakeCasePackage;
 import org.apache.wicket.protocol.http.WebApplication;
+import org.apache.wicket.protocol.https.HttpPage;
 import org.apache.wicket.request.resource.JavaScriptPackageResource;
 import org.apache.wicket.request.resource.PackageResource;
 import org.apache.wicket.request.resource.PackageResourceReference;
@@ -30,6 +30,9 @@ import org.apache.wicket.util.tester.WicketTestCase;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.util.Locale;
+
+
 /**
  * Tests for package resources.
  * 
@@ -189,4 +192,55 @@ public class PackageResourceTest extends WicketTestCase
                final String contentType = 
tester.getLastResponse().getContentType();
                assertEquals("text/javascript; charset=" + encoding, 
contentType);
        }
+
+       @Test
+       public void getResourceStream()
+       {
+               PackageResource resource = new 
PackageResourceReference(PackageResourceTest.class,
+                       "packaged1.txt").getResource();
+               assertNotNull(resource.getResourceStream());
+       }
+
+       @Test(expected = PackageResource.PackageResourceBlockedException.class)
+       public void dontGetResourceStream()
+       {
+               PackageResource resource = new 
PackageResourceReference(HttpPage.class,
+                       "HttpPage.html").getResource();
+               resource.getResourceStream();
+       }
+
+       @Test(expected = PackageResource.PackageResourceBlockedException.class)
+       public void dontGetResourceStreamIfNameHasSuffix()
+       {
+               PackageResource resource = new 
PackageResourceReference(HttpPage.class,
+                       "HttpPage_en.html").getResource();
+               resource.getResourceStream();
+       }
+
+       @Test
+       public void getResourceStreamInSnakeCasePackage()
+       {
+               PackageResource resource = new PackageResourceReference(
+                       TestPageInsideSnakeCasePackage.class, 
"style.css").getResource();
+               assertNotNull(resource.getResourceStream());
+       }
+
+       @Test(expected = PackageResource.PackageResourceBlockedException.class)
+       public void dontGetResourceStreamInSnakeCasePackage()
+       {
+               PackageResource resource = new PackageResourceReference(
+                       TestPageInsideSnakeCasePackage.class,
+                       "TestPageInsideSnakeCasePackage.html").getResource();
+               resource.getResourceStream();
+       }
+
+       @Test(expected = PackageResource.PackageResourceBlockedException.class)
+       public void dontGetResourceStreamInSnakeCasePackageIfNameHasSuffix()
+       {
+               PackageResource resource = new PackageResourceReference(
+                       TestPageInsideSnakeCasePackage.class,
+                       "TestPageInsideSnakeCasePackage_en.html").getResource();
+               resource.getResourceStream();
+       }
+
 }
diff --git 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ClientSideImageMapTest.java
 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ClientSideImageMapTest.java
index 4396371ecb..7df70ba519 100644
--- 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ClientSideImageMapTest.java
+++ 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ClientSideImageMapTest.java
@@ -1,38 +1,38 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.wicket.markup.html.link;
-
-import java.util.Locale;
-
-import org.apache.wicket.util.tester.WicketTestCase;
-import org.junit.Test;
-
-/**
- * @since 1.5
- */
-public class ClientSideImageMapTest extends WicketTestCase
-{
-       /**
-        * @throws Exception
-        */
-       @Test
-       public void testRenderClientSideImageMapPage_1() throws Exception
-       {
-               tester.getSession().setLocale(Locale.US);
-               executeTest(ClientSideImageMapPage_1.class, 
"ClientSideImageMapPageExpectedResult_1.html");
-       }
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.wicket.markup.html.link;
+
+import java.util.Locale;
+
+import org.apache.wicket.util.tester.WicketTestCase;
+import org.junit.Test;
+
+/**
+ * @since 1.5
+ */
+public class ClientSideImageMapTest extends WicketTestCase
+{
+       /**
+        * @throws Exception
+        */
+       @Test
+       public void testRenderClientSideImageMapPage_1() throws Exception
+       {
+               tester.getSession().setLocale(Locale.US);
+               executeTest(ClientSideImageMapPage_1.class, 
"ClientSideImageMapPageExpectedResult_1.html");
+       }
+}
\ No newline at end of file
diff --git 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ExternalLinkTest.java
 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ExternalLinkTest.java
index 2093da6235..c37c56b730 100644
--- 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ExternalLinkTest.java
+++ 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ExternalLinkTest.java
@@ -1,49 +1,86 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.wicket.markup.html.link;
-
-import org.apache.wicket.util.tester.WicketTestCase;
-import org.junit.Test;
-
-/**
- * Test ExternalLink (href="...")
- * 
- * <a href="https://issues.apache.org/jira/browse/WICKET-1016";></<a>
- */
-public class ExternalLinkTest extends WicketTestCase
-{
-       /**
-        * @throws Exception
-        */
-       @Test
-       public void renderExternalLink_1() throws Exception
-       {
-               
tester.getApplication().getMarkupSettings().setAutomaticLinking(true);
-               executeTest(ExternalLinkPage_1.class, 
"ExternalLinkPageExpectedResult_1.html");
-       }
-
-       /**
-        * @throws Exception
-        */
-       @Test
-       public void renderExternalLink_2() throws Exception
-       {
-               
tester.getApplication().getMarkupSettings().setAutomaticLinking(true);
-               executeTest(ExternalLinkPage_2.class, 
"ExternalLinkPageExpectedResult_2.html");
-       }
-
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.wicket.markup.html.link;
+
+import org.apache.wicket.MockPageWithOneComponent;
+import org.apache.wicket.markup.ComponentTag;
+import org.apache.wicket.util.tester.WicketTestCase;
+import org.junit.Test;
+
+import static org.apache.wicket.MockPageWithOneComponent.COMPONENT_ID;
+import static org.hamcrest.CoreMatchers.containsString;
+
+/**
+ * Test ExternalLink (href="...")
+ * 
+ * <a href="https://issues.apache.org/jira/browse/WICKET-1016";></<a>
+ */
+public class ExternalLinkTest extends WicketTestCase
+{
+
+       @Test
+       public void allowsJavascriptScheme() throws Exception
+       {
+               String uri = "javascript:alert(1)";
+               MockPageWithOneComponent page = new MockPageWithOneComponent();
+               page.add(new ExternalLink(COMPONENT_ID, uri){
+                       @Override
+                       protected void onComponentTag(ComponentTag tag)
+                       {
+                               super.onComponentTag(tag);
+                               tag.setName("a");
+                       }
+               });
+
+               tester.startPage(page);
+
+               assertThat(tester.getLastResponseAsString(), 
containsString(uri));
+       }
+
+       @Test
+       public void allowsJavascriptSchemeInPopupTarget() throws Exception
+       {
+               String uri = "javascript:alert(1)";
+               MockPageWithOneComponent page = new MockPageWithOneComponent();
+               page.add(new ExternalLink(COMPONENT_ID, uri));
+
+               tester.startPage(page);
+
+               assertThat(tester.getLastResponseAsString(), 
containsString(uri));
+       }
+
+       /**
+        * @throws Exception
+        */
+       @Test
+    public void renderExternalLink_1() throws Exception
+       {
+               
tester.getApplication().getMarkupSettings().setAutomaticLinking(true);
+               executeTest(ExternalLinkPage_1.class, 
"ExternalLinkPageExpectedResult_1.html");
+       }
+
+       /**
+        * @throws Exception
+        */
+       @Test
+    public void renderExternalLink_2() throws Exception
+       {
+               
tester.getApplication().getMarkupSettings().setAutomaticLinking(true);
+               executeTest(ExternalLinkPage_2.class, 
"ExternalLinkPageExpectedResult_2.html");
+       }
+
+}
diff --git 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/TestPageInsideSnakeCasePackage.html
 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/TestPageInsideSnakeCasePackage.html
new file mode 100644
index 0000000000..ea75f28073
--- /dev/null
+++ 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/TestPageInsideSnakeCasePackage.html
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html>
+<html xmlns:wicket="http://wicket.apache.org";>
+<head>
+    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
+    <title>Test Page</title>
+</head>
+<body>
+none
+</body>
+</html>
diff --git 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ClientSideImageMapTest.java
 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/TestPageInsideSnakeCasePackage.java
similarity index 61%
copy from 
wicket-core/src/test/java/org/apache/wicket/markup/html/link/ClientSideImageMapTest.java
copy to 
wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/TestPageInsideSnakeCasePackage.java
index 4396371ecb..ee3288eaa8 100644
--- 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/link/ClientSideImageMapTest.java
+++ 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/TestPageInsideSnakeCasePackage.java
@@ -1,38 +1,23 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.wicket.markup.html.link;
-
-import java.util.Locale;
-
-import org.apache.wicket.util.tester.WicketTestCase;
-import org.junit.Test;
-
-/**
- * @since 1.5
- */
-public class ClientSideImageMapTest extends WicketTestCase
-{
-       /**
-        * @throws Exception
-        */
-       @Test
-       public void testRenderClientSideImageMapPage_1() throws Exception
-       {
-               tester.getSession().setLocale(Locale.US);
-               executeTest(ClientSideImageMapPage_1.class, 
"ClientSideImageMapPageExpectedResult_1.html");
-       }
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.wicket.markup.html.snake_case;
+
+import org.apache.wicket.markup.html.WebPage;
+
+public class TestPageInsideSnakeCasePackage extends WebPage
+{
+}
diff --git 
a/wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/style.css 
b/wicket-core/src/test/java/org/apache/wicket/markup/html/snake_case/style.css
new file mode 100644
index 0000000000..e69de29bb2
diff --git 
a/wicket-extensions/src/main/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AbstractAutoCompleteRenderer.java
 
b/wicket-extensions/src/main/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AbstractAutoCompleteRenderer.java
index d6d3bef92d..d7af7cc356 100644
--- 
a/wicket-extensions/src/main/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AbstractAutoCompleteRenderer.java
+++ 
b/wicket-extensions/src/main/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AbstractAutoCompleteRenderer.java
@@ -16,6 +16,7 @@
  */
 package org.apache.wicket.extensions.ajax.markup.html.autocomplete;
 
+import org.apache.wicket.core.util.string.JavaScriptUtils;
 import org.apache.wicket.request.Response;
 import org.apache.wicket.util.string.Strings;
 
@@ -50,7 +51,7 @@ public abstract class AbstractAutoCompleteRenderer<T> 
implements IAutoCompleteRe
                final CharSequence handler = 
getOnSelectJavaScriptExpression(object);
                if (handler != null)
                {
-                       response.write(" onselect=\"" + handler + '"');
+                       response.write(" onselect=\"" + 
Strings.escapeMarkup(handler) + '"');
                }
                response.write(">");
                renderChoice(object, response, criteria);
diff --git 
a/wicket-extensions/src/test/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AbstractAutoCompleteRendererTest.java
 
b/wicket-extensions/src/test/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AbstractAutoCompleteRendererTest.java
new file mode 100644
index 0000000000..59e80ab651
--- /dev/null
+++ 
b/wicket-extensions/src/test/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AbstractAutoCompleteRendererTest.java
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.wicket.extensions.ajax.markup.html.autocomplete;
+
+import org.apache.wicket.mock.MockWebResponse;
+import org.apache.wicket.request.Response;
+import org.apache.wicket.util.tester.WicketTestCase;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class AbstractAutoCompleteRendererTest extends WicketTestCase
+{
+       @Test
+       void escapeOnselectJSExpression()
+       {
+               var renderer = new Renderer("alert('hello');");
+               MockWebResponse response = new MockWebResponse();
+               renderer.render("foo", response, null);
+               Assertions.assertTrue(response.getTextResponse().toString()
+                       .contains("<li textvalue=\"foo\" 
onselect=\"alert(&#039;hello&#039;);\">foo</li>"));
+       }
+
+       static class Renderer extends AbstractAutoCompleteRenderer<String>
+       {
+
+               final String expression;
+
+               Renderer(String expression)
+               {
+                       this.expression = expression;
+               }
+
+               @Override
+               protected CharSequence getOnSelectJavaScriptExpression(String 
item)
+               {
+                       return expression;
+               }
+
+               @Override
+               protected void renderChoice(String object, Response response, 
String criteria)
+               {
+                       response.write(object);
+               }
+
+               @Override
+               protected String getTextValue(String object)
+               {
+                       return object;
+               }
+       }
+}

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