CVE-2026-42609 HIGH

CVE-2026-42609: Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic

Vendor Getgrav
Product grav
Weakness CWE-269
Published May 11, 2026
Last update May 14, 2026

CVSS base score

8.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

What the vulnerability does

01Description

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.

Key dates

02Disclosure timeline

May 11, 2026 CVE published
May 14, 2026 Record updated