CVE-2026-56385
Craft CMS versions >= 5.0.0-RC1, <= 5.9.13 and >= 4.0.0-RC1, <= 4.17.7 contain an authorization bypass in the assets/preview-file endpoint. The action does not enforce per-asset view authorization before returning preview content, allowing an authenticated low-privileged user to supply a controlled assetId for an asset they are not permitted to view and still receive preview response data (previewHtml), including a private preview image route containing the target private assetId. Fixed in 5.9.14 and 4.17.8.
- Score
- CVSS 4.0 5.3 Medium
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-06-21
- Last modified
- 2026-10-25
- Weaknesses
- CWE-639
Affected products
References
- https://github.com/craftcms/cms/security/advisories/GHSA-44px-qjjc-xrhq
- https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
- https://www.vulncheck.com/advisories/craft-cms-authorization-bypass-in-assets-preview-file-endpoint
