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 JavaScrip…

Vulnerability class: XSS (Cross-Site Scripting)

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.