---
id: CVE-2025-66296
title: Grav is a file-based Web platform
summary: >-
  Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a privilege
  escalation vulnerability exists in Grav’s Admin plugin due to the absence of
  username uniqueness validation when creating users. A user with the create
  user permissio…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-266
vendor: getgrav
product: grav
affected:
  - 'grav >= 1.7.49.5, < 1.8.0'
  - grav = 1.8.0
patched:
  - grav 1.8.0
published: '2025-12-01'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66296'
references:
  - url: >-
      https://github.com/getgrav/grav/commit/3462d94d575064601689b236508c316242e15741
    label: security-advisories@github.com
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-cjcp-qxvg-4rjm'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00318
epssPercentile: 0.22088
ingestedAt: '2026-09-26T00:22:39.987Z'
---

## Overview

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a privilege escalation vulnerability exists in Grav’s Admin plugin due to the absence of username uniqueness validation when creating users. A user with the create user permission can create a new account using the same username as an existing administrator account, set a new password/email, and then log in as that administrator. This effectively allows privilege escalation from limited user-manager permissions to full administrator access. This vulnerability is fixed in 1.8.0-beta.27.

## Affected

- `grav >= 1.7.49.5, < 1.8.0`
- `grav = 1.8.0`

## Remediation

Upgrade past the affected range:

- `grav 1.8.0`