XWiki xwiki-rendering up to 14.9 XHTML Syntax HTML injection

Summaryinfo

A vulnerability identified as problematic has been detected in XWiki xwiki-rendering up to 14.9. Affected is an unknown function of the component XHTML Syntax Handler. This manipulation causes HTML injection. This vulnerability is handled as CVE-2025-53835. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in XWiki xwiki-rendering up to 14.9 and classified as problematic. Affected by this vulnerability is some unknown functionality of the component XHTML Syntax Handler. The manipulation with an unknown input leads to a html injection vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

XWiki Rendering is a generic rendering system that converts textual input in a given syntax (wiki syntax, HTML, etc) into another syntax (XHTML, etc). Starting in version 5.4.5 and prior to version 14.10, the XHTML syntax depended on the `xdom+xml/current` syntax which allows the creation of raw blocks that permit the insertion of arbitrary HTML content including JavaScript. This allows XSS attacks for users who can edit a document like their user profile (enabled by default). This has been fixed in version 14.10 by removing the dependency on the `xdom+xml/current` syntax from the XHTML syntax. Note that the `xdom+xml` syntax is still vulnerable to this attack. As it's main purpose is testing and its use is quite difficult, this syntax shouldn't be installed or used on a regular wiki. There are no known workarounds apart from upgrading.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-53835 since 07/09/2025. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 14.10 eliminates this vulnerability. Applying the patch a4ca31f99f524b9456c64150d6f375984aa81ea7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Content Management System

Vendor

• XWiki

Name

• xwiki-rendering

Version

• 14.0
• 14.1
• 14.2
• 14.3
• 14.4
• 14.5
• 14.6
• 14.7
• 14.8
• 14.9

License

• open-source

Website

• Product: https://github.com/xwiki/xwiki-rendering/

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