Improper access control in Grav CMS - CVE-2025-66301

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Main Vulnerability Database Vulnerabilities #VU130065

Improper access control in Grav CMS - CVE-2025-66301

Published: May 5, 2026


Vulnerability identifier: #VU130065
CSH Severity: Low
CVSSv4.0: 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/E:A/U:Clear
CVE-ID: CVE-2025-66301
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: The vulnerability is being exploited in the wild
Vulnerable software:
Grav CMS
Software vendor:
Grav CMS

Description

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.


Remediation

Install security update from vendor's website.

External links