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CVE-2026-56385

Craft CMS - Authorization Bypass in assets/preview-file Endpoint

Published: Jun 21, 2026Updated: Jun 22, 2026 Sources: CVE List NVDCWE-639
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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 Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-639

Affected Products

cmscraftcmsWeb & CMS Plugins
craftcmscommercialNZWeb & CMS Plugins

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
github.com
https://github.com/craftcms/cms/security/advisories/GHSA-44px-qjjc-xrhq
github.com
https://www.vulncheck.com/advisories/craft-cms-authorization-bypass-in-assets-preview-file-endpoint
vulncheck.com

Timeline

Published
Jun 21, 2026
Last Updated
Jun 22, 2026

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