Medium severity · published Jun 21, 2026
CVE-2026-56385
Craft CMS - Authorization Bypass in assets/preview-file Endpoint
4.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
cms · craftcms
5.0.0-RC1 before 5.9.14; 4.0.0-RC1 before 4.17.8 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56385
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56385
github.com
https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
github.com
https://github.com/craftcms/cms/security/advisories/GHSA-44px-qjjc-xrhq
www.vulncheck.com
https://www.vulncheck.com/advisories/craft-cms-authorization-bypass-in-assets-preview-file-endpoint
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