---
id: CVE-2026-109321
title: >-
  Grav Login OAuth plugin (grav-plugin-login-oauth) before 1.4.3 provisions
  OAuth accounts as ordinary Grav users with a deterministic <provider>.<id>
  username and an unsalted MD5 hash of the provider identifier as the password,
  without di…
summary: >-
  Grav Login OAuth plugin (grav-plugin-login-oauth) before 1.4.3 provisions
  OAuth accounts as ordinary Grav users with a deterministic <provider>.<id>
  username and an unsalted MD5 hash of the provider identifier as the password,
  without di…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-1391
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:27.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109321'
references:
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-mj8v-hvf6-73gm'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/grav-login-oauth-plugin-before-1.4.3-predictable-local-credentials-authentication-bypass
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T18:00:08.201Z'
---

## Overview

Grav Login OAuth plugin (grav-plugin-login-oauth) before 1.4.3 provisions OAuth accounts as ordinary Grav users with a deterministic <provider>.<id> username and an unsalted MD5 hash of the provider identifier as the password, without disabling password login. Unauthenticated remote attackers who learn or guess a provider identifier can reproduce these credentials and log in, gaining administrative control of privileged accounts.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.