Code Injection in Craft CMS - #VU145005
Published: August 25, 2026
Vulnerability identifier: #VU145005
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper control of code generation in field-layout hydration when processing a field-layout tab whose element value is posted as a JSON string. A remote user can submit crafted field-layout element data with behavior or event-handler keys to execute arbitrary code.
No administrative or special permission is required, and exploitation is reachable by any authenticated control-panel user.
Affected software
Craft CMS
Remediation
Install security update from vendor's website.
Craft CMS - update to 5.10.12