CVE-2026-26000

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Prior to 17.9.0, 17.4.6, and 16.10.13, it's possible using comments to inject CSS that would transform the full wiki in a link area leading to a malicious page. This vulnerability is fixed in 17.9.0, 17.4.6, and 16.10.13.

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Prior to 17.9.0, 17.4.6, and 16.10.13, it's possible using comments to inject CSS that would transform the full wiki in a link area leading to a malicious page. This vulnerability is fixed in 17.9.0, 17.4.6, and 16.10.13.

Impact

It's possible using comments to inject CSS that would transform the full wiki in a link area leading to a malicious page. All versions of XWiki are impacted by this kind of attack.

Patches

The problem has been patched not by preventing injecting CSS in comments, which is currently a feature of XWiki, but by requiring confirmation from users when driving them to untrusted domains after clicking on a link, thus preventing any click-jacking attack. This security measure has been put in place in XWiki 17.9.0, 17.4.6, 16.10.13.

Workarounds

There's no out-of-the-box workaround, but it should be possible to partly reuse the javascript code provided for the security measure in a JSX object inside the wiki, to request the same kind of confirmation.

References

• JIRA ticket: https://jira.xwiki.org/browse/XWIKI-23433
• Documentation of the new security measure: https://www.xwiki.org/xwiki/bin/view/ReleaseNotes/Data/XWiki/17.9.0RC1/Entry006/
• Commit for the security fix: https://github.com/xwiki/xwiki-platform/commit/29cb81f3a5387cf822d7e7534bdd63903275f86b

For more information

If you have any questions or comments about this advisory:

• Open an issue in Jira XWiki.org
• Email us at Security Mailing List

Attribution

Thanks Tomas Keech (Sentrium Security Ltd) for reporting this vulnerability.

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Prior to 17.9.0, 17.4.6, and 16.10.13, it's possible using comments to inject CSS that would transform the full wiki in a link area leading to a malicious page. This vulnerability is fixed in 17.9.0, 17.4.6, and 16.10.13.

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Prior to 17.9.0, 17.4.6, and 16.10.13, it's possible using comments to inject CSS that would transform the full wiki in a link area leading to a malicious page. This vulnerability is fixed in 17.9.0, 17.4.6, and 16.10.13.

Impact

It's possible using comments to inject CSS that would transform the full wiki in a link area leading to a malicious page. All versions of XWiki are impacted by this kind of attack.

Patches

The problem has been patched not by preventing injecting CSS in comments, which is currently a feature of XWiki, but by requiring confirmation from users when driving them to untrusted domains after clicking on a link, thus preventing any click-jacking attack. This security measure has been put in place in XWiki 17.9.0, 17.4.6, 16.10.13.

Workarounds

There's no out-of-the-box workaround, but it should be possible to partly reuse the javascript code provided for the security measure in a JSX object inside the wiki, to request the same kind of confirmation.

References

• JIRA ticket: https://jira.xwiki.org/browse/XWIKI-23433
• Documentation of the new security measure: https://www.xwiki.org/xwiki/bin/view/ReleaseNotes/Data/XWiki/17.9.0RC1/Entry006/
• Commit for the security fix: https://github.com/xwiki/xwiki-platform/commit/29cb81f3a5387cf822d7e7534bdd63903275f86b

For more information

If you have any questions or comments about this advisory:

• Open an issue in Jira XWiki.org
• Email us at Security Mailing List

Attribution

Thanks Tomas Keech (Sentrium Security Ltd) for reporting this vulnerability.