high8.1
CVE-2026-42609
Grav Vulnerable to Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | getgrav/grav | < 2.0.0-beta.2 | 2.0.0-beta.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Getgrav | Grav | through 1.8.0 Version 2.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-rr73-568v-28f8
- https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8
- https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663
- https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47
- https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632
- https://nvd.nist.gov/vuln/detail/CVE-2026-42609