Improper access control in Grav CMS - CVE-2025-66301
Published: May 5, 2026
Vulnerability identifier: #VU130065
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-66301
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote user to modify form processing actions.
The vulnerability exists due to improper access control in /admin/pages/{page_name} when handling crafted POST requests that modify data[_json][header][form]. A remote user can send a specially crafted request to modify form processing actions.
Exploitation requires the Admin and Form plugins to be installed.
Affected software
Grav CMS
How to mitigate CVE-2025-66301
Install security update from vendor's website.
Grav CMS - update to 1.8.0 beta.27