What’s Vulnerable › Vulnerabilities

CVE-2026-41128: Craft CMS has a Missing Authorization Check on User Group Removal via save-permissions Action

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-10-26
• Weakness: CWE-862

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.

Affected products

• craftcms cms: from 5.6.0, < 5.9.15

References

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

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