GHSA-jq2f-59pj-p3m3: Craft CMS has a Missing Authorization Check on User Group Removal via save-permissions Action

April 14, 2026

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.

References

github.com/advisories/GHSA-jq2f-59pj-p3m3
github.com/craftcms/cms
github.com/craftcms/cms/commit/b135384808ad43fcf8836a9dd9b877fb0087bc27
github.com/craftcms/cms/security/advisories/GHSA-jq2f-59pj-p3m3

Code Behaviors & Features

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