XWiki vulnerable to click-jacking through CSS injection in comments

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-26000: 0.32% estimated exploitation activity in the next 30 days; percentile 24.52 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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:…

Published by the source

12 Feb 2026, 15:54 UTC

Last modified by the source

12 Feb 2026, 22:08 UTC

Source last checked

26 Oct 2026, 16:44 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-74rh-c5rh-88vg

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# Patch Next advisory brief: CVE-2026-26000

Advisory: XWiki vulnerable to click-jacking through CSS injection in comments
IDs: CVE-2026-26000, GHSA-74rh-c5rh-88vg
Record: https://patchnext.com/advisories/cve-2026-26000 (revision 1, source checked 26 Oct 2026, 16:44 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.xwiki.platform:xwiki-platform-web 17.9.0, 17.4.6, 16.10.13. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-web: affected >= 17.5.0, < 17.9.0; >= 17.0.0-rc-1, < 17.4.6; < 16.10.13; fixed in 17.9.0, 17.4.6, 16.10.13

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-web: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.xwiki.platform:xwiki-platform-web.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-74rh-c5rh-88vg (GitHub-reviewed advisory GHSA-74rh-c5rh-88vg lists affected ranges: Maven org.xwiki.platform:xwiki-platform-web >=17.5.0 =17.0.0-rc-1 =0 <16.10.13)

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