CVE-2026-56385
Published:June 21, 2026
Updated:June 29, 2026
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.
Affected Packages
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.0.0-RC1 <5.9.14Fix Suggestion:
Update to version 5.9.14https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.0.0-RC1 <4.17.8Fix Suggestion:
Update to version 4.17.8craftcms/cms (PHP):
Affected version(s) >=4.0.0-RC1 <4.17.8Fix Suggestion:
Update to version 4.17.8craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.9.14Fix Suggestion:
Update to version 5.9.14Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
EPSS
Base Score:
0.22