Improperly Controlled Modification of Dynamically-Determined Object Attributes in Craft CMS - #VU139963
Published: July 29, 2026
Vulnerability identifier: #VU139963
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-915
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 improperly controlled modification of dynamically-determined object attributes in the control panel element-search condition handling when processing a request containing a crafted condition.config JSON string. A remote user can send a specially crafted request to execute arbitrary code.
A valid control panel session and CSRF token are required. Command execution is semi-blind and may be confirmed through a server-side file-write side effect retrieved in a subsequent request.
Affected software
Craft CMS
Remediation
Install security update from vendor's website.
Craft CMS - addressed in versions 4.18.2, 5.10.6