{"id":"CVE-2026-41128","aliases":["GHSA-jq2f-59pj-p3m3"],"url":"https://o3.security/vulnerability/CVE-2026-41128","summary":"Craft CMS has a Missing Authorization Check on User Group Removal via save-permissions Action","details":"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.","published":"2026-04-21T23:32:37.911Z","modified":"2026-08-07T11:31:23.501144777Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"craftcms/cms","fixedVersion":"5.9.15"}],"fix":{"url":"https://github.com/craftcms/cms/commit/b135384808ad43fcf8836a9dd9b877fb0087bc27","label":"craftcms/cms@b135384"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41128.json"},{"type":"ADVISORY","url":"https://github.com/craftcms/cms/security/advisories/GHSA-jq2f-59pj-p3m3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41128"},{"type":"FIX","url":"https://github.com/craftcms/cms/commit/b135384808ad43fcf8836a9dd9b877fb0087bc27"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:23.501144777Z"}}