CVE-2026-56384
5.3
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| craftcms | cms | 4.0.0-RC1 < 4.17.8 | affected |
| craftcms | cms | 4.17.8 | unaffected |
| craftcms | cms | 5.0.0-RC1 < 5.9.14 | affected |
| craftcms | cms | 5.9.14 | unaffected |
Weaknesses
- CWE-862: Missing Authorization
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg
- https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
- https://www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint
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