CVE-2026-56381

Medium

Description

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.

SeverityMedium

CVSS4.8

Exploit probability—

ProductCraftcms/cms

PublishedJun 21, 2026

First seenJun 21, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

craftcms/cms5.8.22 or later

Vendor advisories

github.com/craftcms/cms/security/advisories/GHSA-g3hp-vvqf-8vw6

Affected products

Product	Affected versions	Fixed in
craftcms/cmsPackagist	5.0.0-RC1 ≤ v < 5.8.22	5.8.22

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