CVE-2026-56384
Craft CMS - Missing Authorization in assets/preview-thumb Endpoint
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-862 |
| Vendor | craftcms |
| Product | cms |
| Published | Jun 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
craftcms / cms
4.0.0-RC1 < 4.17.8 5.0.0-RC1 < 5.9.14
References
Credits
🔍 Susen2