CVE-2026-56385: Craft CMS versions >= 5.0.0-RC1, = 4.0.0-RC1, <= 4.17.7 contain an authorization bypass in the assets/preview-file endpoint. The action does not enforce…

PriorityP424medium4.3CVSS 3.1

AVNACLPRLUINSUCLINAN

EPSS

0.22%

12.6th percentile

Craft CMS versions >= 5.0.0-RC1, = 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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
craftcms	cms	>= 4.0.0-RC1 < 4.17.8	4.17.8
craftcms	cms	>= 5.0.0-RC1 < 5.9.14	5.9.14

CVSS provenance

nvdv3.14.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

nvdv4.05.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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