GHSA-x76w-8c62-48mg: Craft CMS: Authenticated "assets/preview-thumb" discloses signed fallback transform preview link to CP users without asset-view permission
(updated )
A user with Control Panel access but without permission to view a target private asset can call assets/preview-thumb and receive preview HTML that contains a signed fallback transform link for that private asset.
References
- github.com/advisories/GHSA-x76w-8c62-48mg
- github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
- github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg
- nvd.nist.gov/vuln/detail/CVE-2026-56384
- www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint
Code Behaviors & Features
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