# CVE-2026-42609

## Summary

- **CVE ID:** CVE-2026-42609
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H)
- **CWE:** CWE-269, CWE-285, CWE-639, CWE-837
- **Published:** May 11, 2026
- **Last Modified:** May 14, 2026

## 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.

## Affected Products

- getgrav — grav (< 2.0.0-beta.2)

## References

- [CNA](https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8)
- [CNA](https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663)
- [CNA](https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47)
- [CNA](https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.46%
- **EPSS Percentile:** 38.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._