CVE-2026-56384 — Craft CMS - Missing Authorization in assets/preview-thumb Endpoint
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 th…
Published: 2026-06-21 · CVSS: 5.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7