Vulnerability Description
Craft CMS is a content management system (CMS). In versions 5.6.0 through 5.9.14, the `actionSavePermissions()` endpoint allows a user with only `viewUsers` permission to remove arbitrary users from all user groups. While `_saveUserGroups()` enforces per-group authorization for additions, it performs no equivalent authorization check for removals, so submitting an empty `groups` value removes all existing group memberships. Version 5.9.15 contains a patch.
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/commit/b135384808ad43fcf8836a9dd9b877fb0087bc27
- https://github.com/craftcms/cms/security/advisories/GHSA-jq2f-59pj-p3m3
FAQ
What is CVE-2026-41128?
CVE-2026-41128 is a documented vulnerability. Craft CMS is a content management system (CMS). In versions 5.6.0 through 5.9.14, the `actionSavePermissions()` endpoint allows a user with only `viewUsers` permission to remove arbitrary users from a...
How severe is CVE-2026-41128?
CVSS scoring is not yet available for CVE-2026-41128. Check NVD for updates.
Is there a patch for CVE-2026-41128?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.