Improper access control in Grav CMS - CVE-2025-66296
Published: May 5, 2026
Vulnerability identifier: #VU130052
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: CVE-2025-66296
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to escalate privileges.
The vulnerability exists due to improper access control in the Grav Admin user creation functionality when creating user accounts. A remote user can create a new account using the same username as an existing administrator account and set new credentials to escalate privileges.
The issue can result in takeover of an existing administrator account.
Affected software
Grav CMS
How to mitigate CVE-2025-66296
Install security update from vendor's website.
Grav CMS - update to 1.8.0 beta.27