Incorrect comparison in Craft CMS - #VU159608
Published: November 6, 2026
Vulnerability identifier: #VU159608
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-697
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to execute arbitrary PHP code on a Craft CMS server.
The vulnerability exists due to incorrect null checks in image transform validation when class is null and __class selects another PHP class. An unauthenticated remote attacker can use a public site user's profile photo accessor during sandboxed rendering of Craft Commerce's signed redirect parameter at payments/pay to instantiate an attacker-selected class.
Affected software
Craft CMS
Remediation
Install security update from vendor's website.
Craft CMS - update to 5.11.4