What is CVE-2026-56384?

CVE-2026-56384 is a medium-severity vulnerability in Craftcms Cms, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-06-21.

How severe is CVE-2026-56384?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Craftcms Cms

CVE-2026-56384

Craft CMS contains a missing authorization vulnerability in the assets/preview-thumb endpoint. A Control Panel user without permission to view a target private asset can call the endpoint with an attacker-controlled assetId and receive pre…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Craftcms Cms — versions 4.0.0-RC1, 4.17.8, 5.0.0-RC1

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

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

Frequently asked questions

What is CVE-2026-56384?: CVE-2026-56384 is a medium-severity vulnerability in Craftcms Cms, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-06-21.
How severe is CVE-2026-56384?: Medium severity. CVSS v3 base score is 4.3 out of 10.