CVE-2026-41128
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductCraftcms/cms
PublishedApr 22, 2026
First seenApr 22, 2026
Weakness typeCWE-862Missing authorization
How to fix
Update
- craftcms/cms5.9.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| craftcms/cmsPackagist | 5.6.0 ≤ v < 5.9.15 | 5.9.15 |
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