CVE-2025-53835

Public Exploit
XWiki Rendering is vulnerable to XSS attacks through insecure XHTML syntax

Description

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.

Category

9.0
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 0.58%
Third-Party Advisory github.com
Affected: xwiki xwiki-rendering
Published at:
Updated at:

References

Link Tags
https://github.com/xwiki/xwiki-rendering/security/advisories/GHSA-w3wh-g4m9-783p third party advisory patch
https://github.com/xwiki/xwiki-rendering/commit/a4ca31f99f524b9456c64150d6f375984aa81ea7 patch
https://jira.xwiki.org/browse/XRENDERING-660 issue tracking

Frequently Asked Questions

What is the severity of CVE-2025-53835?
CVE-2025-53835 has been scored as a critical severity vulnerability.
How to fix CVE-2025-53835?
To fix CVE-2025-53835, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-53835 being actively exploited in the wild?
It is possible that CVE-2025-53835 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-53835?
CVE-2025-53835 affects xwiki xwiki-rendering.
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