What is CVE-2026-56381?

CVE-2026-56381 is a medium-severity vulnerability in Craftcms Cms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-06-21.

How severe is CVE-2026-56381?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Craftcms Cms

CVE-2026-56381

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 class: XSS (Cross-Site Scripting)

EPSS: 0.003 (16.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

Affected products

Craftcms Cms — versions 5.0.0-RC1, 5.8.22

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56381?: CVE-2026-56381 is a medium-severity vulnerability in Craftcms Cms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-06-21.
How severe is CVE-2026-56381?: Medium severity. CVSS v3 base score is 4.8 out of 10.