Missing Authorization in Craft CMS - CVE-2026-41128
Published: June 16, 2026
Vulnerability identifier: #VU134667
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41128
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to remove arbitrary users from all user groups.
The vulnerability exists due to improper access control in the actionSavePermissions() endpoint and _saveUserGroups() method when handling a crafted save-permissions request with an empty groups value. A remote user can send a specially crafted POST request to remove arbitrary users from all user groups.
Exploitation requires a control panel account with accessCp and viewUsers permissions, and only Pro edition or higher is affected.
Affected software
Craft CMS
How to mitigate CVE-2026-41128
Install security update from vendor's website.
Craft CMS - update to 5.9.15