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 preview HTML containing a signed fallback transform preview...

GHSA-44PX-QJJC-XRHQ Craft CMS: Authorized asset "preview file" requests bypass allows users without asset access to retrieve private preview metadata

Summary An authenticated low-privileged user can call assets/preview-file for an asset they are not authorized to view and still receive preview response data previewHtml for that private asset. The returned preview HTML included a private preview image route containing the target private assetId...

Craft CMS: Authorized asset "preview file" requests bypass allows users without asset access to retrieve private preview metadata

Summary An authenticated low-privileged user can call assets/preview-file for an asset they are not authorized to view and still receive preview response data previewHtml for that private asset. The returned preview HTML included a private preview image route containing the target private assetId...