CVE-2026-53966: XWiki XWiki-Platform

High severity, CVSS 7.1. EPSS: 0.8% chance of exploitation in the next 30 days.

XWiki Platform is a generic wiki platform. From 13.4-rc-1 until 16.10.17, 17.4.10, 17.10.4, and 18.1.0-rc-1, the Live Data edit REST API allows a user who can edit a page to change that page's rights without executing the normal document-saving authorization checks. The user can grant script right and then execute potentially dangerous Velocity scripts or send unfiltered HTML and JavaScript to clients. The same missing checks can circumvent extension security controls implemented as listeners for UserUpdatingDocumentEvent and related user document events. This issue is fixed in versions 16.10.17, 17.4.10, 17.10.4, and 18.1.0-rc-1.

Affected products

• XWiki XWiki-Platform: from 13.4-rc-1, before 16.10.17 (fixed in 16.10.17); from 17.0.0-rc-1, before 17.4.10 (fixed in 17.4.10); from 17.5.0-rc-1, before 17.10.4 (fixed in 17.10.4); from 18.0.0-rc-1, before 18.1.0-rc-1 (fixed in 18.1.0-rc-1)

Published 2026-09-15. Last modified 2026-09-30.