Apache Wicket up to 8.19.0/9.24.0/10.11.0 AjaxNewWindowNotifyingBehavior windowName neutralization

Summaryinfo

A vulnerability categorized as critical has been discovered in Apache Wicket up to 8.19.0/9.24.0/10.11.0. Affected by this vulnerability is an unknown functionality of the component AjaxNewWindowNotifyingBehavior. Executing a manipulation of the argument windowName can lead to neutralization. This vulnerability is tracked as CVE-2026-82956. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Apache Wicket up to 8.19.0/9.24.0/10.11.0 and classified as critical. This vulnerability affects an unknown functionality of the component AjaxNewWindowNotifyingBehavior. The manipulation of the argument windowName with an unknown input leads to a neutralization vulnerability. The CWE definition for the vulnerability is CWE-707. The product does not ensure or incorrectly ensures that structured messages or data are well-formed and that certain security properties are met before being read from an upstream component or sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.ajax.AjaxNewWindowNotifyingBehavior notices that a page instance has been opened in a second browser window or tab. It asks the browser for the value of window.name, which reaches the server as the request parameter windowName, and remembers what the browser reported in a field of the behaviour. That field is part of the page's serialized state, so the remembered value stays in the page store for as long as the page instance does. On every later render of that page instance the behaviour builds the precondition of its Ajax call by substituting the remembered value into a single-quoted JavaScript string literal, and Wicket writes that precondition into the page as raw JavaScript, because the precondition of an Ajax call listener is script supplied by the caller and is emitted without quoting or escaping. Nothing on that path escapes the value. The window name is client-supplied and Wicket applies no validation to it, so a remembered name containing a single quote ends the literal and the rest of it runs as script in the application's origin, every time that page instance is rendered. An application is affected only where it has explicitly added AjaxNewWindowNotifyingBehavior to a component. No part of the framework installs the behaviour, so an application that does not use it is not affected. The name the behaviour generates for itself, when the browser reports no name at all, is a random UUID and is not client-supplied. This issue affects Apache Wicket: from 8.0.0 through 8.19.0, from 9.0.0 through 9.24.0, from 10.0.0 through 10.11.0. Users are recommended to upgrade to version 8.20.0, 9.25.0 or 10.12.0, which fix the issue.

The advisory is available at lists.apache.org. This vulnerability was named CVE-2026-82956 since 08/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/01/2026).

Upgrading to version 8.20.0, 9.25.0 or 10.12.0 eliminates this vulnerability.

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Productinfo

Vendor

• Apache

Name

• Wicket

Version

• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 8.6
• 8.7
• 8.8
• 8.9
• 8.10
• 8.11
• 8.12
• 8.13
• 8.14
• 8.15
• 8.16
• 8.17
• 8.18
• 8.19.0
• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12
• 9.13
• 9.14
• 9.15
• 9.16
• 9.17
• 9.18
• 9.19
• 9.20
• 9.21
• 9.22
• 9.23
• 9.24.0
• 10.0
• 10.1
• 10.2
• 10.3
• 10.4
• 10.5
• 10.6
• 10.7
• 10.8
• 10.9
• 10.10
• 10.11.0

License

• open-source

Website

• Vendor: https://www.apache.org/

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