CVE-2026-56381: Craft CMS CMS

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Craft CMS CMS: from 5.0.0-RC1, before 5.8.22 (fixed in 5.8.22)

Published 2026-06-21. Last modified 2026-06-23.