CVE-2026-56385

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (3)

Core 3
Core References
Vendor Advisory vendor-advisory
GHSA Advisory GHSA-44px-qjjc-xrhq
https://github.com/craftcms/cms/security/advisories/GHSA-44px-qjjc-xrhq
Third Party Advisory third-party-advisory
VulnCheck Advisory: Craft CMS - Authorization Bypass in assets/preview-file Endpoint
https://www.vulncheck.com/advisories/craft-cms-authorization-bypass-in-assets-preview-file-endpoint

Scores

CVSS v3 4.3
EPSS 0.0022
EPSS Percentile 12.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-639
Status published
Products (4)
craftcms/cms 4.0.0-RC1 - 4.17.8
craftcms/cms 4.17.8
craftcms/cms 5.0.0-RC1 - 5.9.14
craftcms/cms 5.9.14
Published Jun 21, 2026
Tracked Since Jun 21, 2026