Vulnerability Description
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 preview HTML containing a signed fallback transform preview link for that private asset, because no asset-view permission check is performed before preview generation. This affects versions >= 4.0.0-RC1, <= 4.17.7 and >= 5.0.0-RC1, <= 5.9.13, and is fixed in 4.17.8 and 5.9.14.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
- https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg
- https://www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-p
FAQ
What is CVE-2026-56384?
CVE-2026-56384 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 atta...
How severe is CVE-2026-56384?
CVE-2026-56384 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56384?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.