Craft CMS 5.0.0-RC1 XSS via Unescaped User Group Names
CVE-2026-56381 Published on June 21, 2026
Craft CMS - Stored XSS via User Group Name in User Permissions Page
Craft CMS from version 5.0.0-RC1 contains a stored cross-site scripting vulnerability in the User Permissions page where user group names are rendered without proper HTML escaping. Attackers with admin access can inject arbitrary JavaScript via the user group name field that executes when other users view or edit permissions.
Vulnerability Analysis
CVE-2026-56381 can be exploited with network access, requires user interaction and user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-56381 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-56381
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Affected Versions
craftcms cms:- Version 5.0.0-RC1 and below 5.8.22 is affected.
- Version 5.8.22 is unaffected.