Improper Neutralization of Special Elements Used in a Template Engine in Craft CMS - CVE-2026-28697
Published: June 16, 2026
Vulnerability identifier: #VU134655
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-28697
CWE-ID: CWE-1336
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Pixel & Tonic, Inc.
Affected software:
Craft CMS
Craft CMS
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper neutralization of special elements used in a template engine in Twig template fields when rendering attacker-controlled template content. A remote user can inject a server-side template injection payload that writes a malicious PHP script to a web-accessible directory to execute arbitrary code.
Exploitation requires access to an authenticated administrator account with allowAdminChanges enabled, or access to the System Messages utility.
How to mitigate CVE-2026-28697
Install security update from vendor's website.