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

What is CVE-2026-42609?

CVE-2026-42609 is a high-severity vulnerability in Getgrav Grav, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-837, CWE-639, CWE-285, CWE-269

Which versions are affected by CVE-2026-42609?

2 open source packages ship an affected version, including getgrav/grav. It affects 1 product.

Products include Getgrav Grav.

How do I fix CVE-2026-42609?

Upgrade getgrav/grav to 2.0.0-beta.2 or later.

Is CVE-2026-42609 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42609 exists.

Other vulnerabilities in Getgrav Grav

• CVE-2023-34251 Grav Server Side Template Injection vulnerability Critical 10.0
• CVE-2025-46199 Cross-site scripting in n/a Critical 9.8
• CVE-2021-47812 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) Critical 9.3
• CVE-2025-66844 Grav may be vulnerable to SSRF attack via Twig Templates Critical 9.1
• CVE-2022-2073 Code Injection in getgrav/grav Critical 9.1

All Getgrav Grav vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-rr73-568v-28f8.