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.

CVSS 4.0

5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-25)

CWE

CWE-639

Published

2026-06-21

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
• https://github.com/craftcms/cms/security/advisories/GHSA-44px-qjjc-xrhq
• https://www.vulncheck.com/advisories/craft-cms-authorization-bypass-in-assets-preview-file-endpoint

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