---
title: "CVE-2026-109321: Grav Login OAuth plugin - Authentication Bypass"
description: "Grav Login OAuth plugin before 1.4.3 contains a broken authentication caused by predictable username and unsalted MD5 hashed password generation, letting unauthenticated remote attackers gain administrative access by guessing provider identifiers."
url: https://panop.io/threat-heartbeat/CVE-2026-109321/
---

# CVE-2026-109321 Grav Login OAuth plugin - Authentication Bypass

Grav Login OAuth plugin before 1.4.3 contains a broken authentication caused by predictable username and unsalted MD5 hashed password generation, letting unauthenticated remote attackers gain administrative access by guessing provider identifiers.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.40% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-109321)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

12 October 2026

Updated

15 October 2026

Weakness

[CWE-1391](https://cwe.mitre.org/data/definitions/1391.html)

## Vendor fix

Upgrade to version 1.4.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-109321](https://nvd.nist.gov/vuln/detail/CVE-2026-109321)
- [https://github.com/getgrav/grav/security/advisories/GHSA-mj8v-hvf6-73gm](https://github.com/getgrav/grav/security/advisories/GHSA-mj8v-hvf6-73gm)
- [https://www.vulncheck.com/advisories/grav-login-oauth-plugin-before-1.4.3-predictable-local-credentials-authentication-bypass](https://www.vulncheck.com/advisories/grav-login-oauth-plugin-before-1.4.3-predictable-local-credentials-authentication-bypass)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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