CVE-2026-42609

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.

References

• https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663
• https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47
• https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632
• https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8