CVE-2026-56384

MediumCVSS 4.3/10Last modified Oct 25, 2026

Description

Craft CMS contains a missing authorization vulnerability in the assets/preview-thumb endpoint. A Control Panel user without permission to view a target private asset can call the endpoint with an attacker-controlled assetId and receive preview HTML containing a signed fallback transform preview link for that private asset, because no asset-view permission check is performed before preview generation. This affects versions >= 4.0.0-RC1, <= 4.17.7 and >= 5.0.0-RC1, <= 5.9.13, and is fixed in 4.17.8 and 5.9.14.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-862

Affected software

Vendor	Product	Versions
craftcms	cms	>= 4.0.0-RC1, < 4.17.8; >= 5.0.0-RC1, < 5.9.14

References

Timeline

Published: Jun 21, 2026
Last modified: Oct 25, 2026
NVD status: Deferred

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