CVE-2025-66474: XWiki XWiki-Rendering

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

XWiki Rendering is a generic rendering system that converts textual input in a given syntax (wiki syntax, HTML, etc) into another syntax (XHTML, etc). Versions 16.10.9 and below, 17.0.0-rc-1 through 17.4.2 and 17.5.0-rc-1 through 17.5.0 have insufficient protection against {{/html}} injection, which attackers can exploit through RCE. Any user who can edit their own profile or any other document can execute arbitrary script macros, including Groovy and Python macros, which enable remote code execution as well as unrestricted read and write access to all wiki contents. This issue is fixed in versions 16.10.10, 17.4.3 and 17.6.0-rc-1.

Affected products

• XWiki XWiki-Rendering: before 16.10.10 (fixed in 16.10.10); from 17.0.0, before 17.4.3 (fixed in 17.4.3); version 17.5.0 only

Published 2025-12-10. Last modified 2026-09-25.