CVE-2026-56385

Craft CMS - Authorization Bypass in assets/preview-file Endpoint

State: Published
Severity: 5.3 Medium
Published: Jun 21, 2026
Updated: Jun 22, 2026
Reserved: Jun 21, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	VulnCheck

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
cmscraftcms	5.0.0-RC1 to before 5.9.14Affected 5.9.14Not affected 4.0.0-RC1 to before 4.17.8Affected 4.17.8Not affected

References

GHSA Advisory GHSA-44px-qjjc-xrhqvendor-advisory
https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27patch
VulnCheck Advisory: Craft CMS - Authorization Bypass in assets/preview-file Endpointthird-party-advisory

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