XWiki Platform: Privilege escalation from edit to script right through Live Data editing

Summary

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.

Timeline

1. Sep 15, 2026, 2:38 PM UTCCVE published
2. Sep 15, 2026, 5:38 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Sep 15, 2026, 6:03 PM UTCRecord last updated

Affected versions

• xwiki xwiki-platform

  From 13.4-rc-1 · fixed in 16.10.17; From 17.0.0-rc-1 · fixed in 17.4.10; From 17.5.0-rc-1 · fixed in 17.10.4; From 18.0.0-rc-1 · fixed in 18.1.0-rc-1

• org.xwiki.platform:xwiki-platform-livedata-livetableMaven

  From 13.4-rc-1 · fixed in 16.10.17

• org.xwiki.platform:xwiki-platform-livedata-livetableMaven

  From 17.0.0-rc-1 · fixed in 17.4.10

• org.xwiki.platform:xwiki-platform-livedata-livetableMaven

  From 17.5.0-rc-1 · fixed in 17.10.4

• org.xwiki.platform:xwiki-platform-livedata-livetableMaven

  From 18.0.0-rc-1 · fixed in 18.1.0-rc-1

References 10