Medium severity4.3NVD Advisory· Published Jun 21, 2026· Updated Jun 22, 2026
CVE-2026-56385
CVE-2026-56385
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
craftcms/cmsPackagist | >= 5.0.0-RC1, < 5.9.14 | 5.9.14 |
craftcms/cmsPackagist | >= 4.0.0-RC1, < 4.17.8 | 4.17.8 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-44px-qjjc-xrhqghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-56385ghsaADVISORY
- github.com/craftcms/cms/commit/b1cddf72c98a66801beb04ea4b07e72182b7b7dbghsaWEB
- github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27nvdWEB
- github.com/craftcms/cms/security/advisories/GHSA-44px-qjjc-xrhqnvdWEB
- www.vulncheck.com/advisories/craft-cms-authorization-bypass-in-assets-preview-file-endpointnvdWEB
News mentions
1- Craft CMS: Nine Vulnerabilities Including RCE and SSRF Disclosed in BatchVypr Intelligence · Jun 21, 2026