Input validation error in Grav CMS - CVE-2026-42613
Published: May 5, 2026
Vulnerability identifier: #VU130076
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-42613
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Grav CMS
Affected software:
Grav CMS
Grav CMS
Detailed vulnerability description
The vulnerability allows a remote attacker to escalate privileges.
The vulnerability exists due to improper input validation in the Login::register() method in the Login plugin when handling registration POST data. A remote attacker can submit crafted groups or access fields in a registration request to escalate privileges.
Exploitation requires registration to be enabled and the groups or access fields to be included in the configured allowed fields list.
How to mitigate CVE-2026-42613
Install security update from vendor's website.