---
title: "CVE-2026-67411: RabbitMQ - Authentication Bypass"
description: "RabbitMQ 3.13.0 to 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3 contains an authentication bypass caused by loss of proxy-derived client address before loopback_users check in MQTT components, letting attackers with valid loopback-restricted credentials bypass source-address restrictions, exploit requires valid credentials for loopback-restricted account."
url: https://panop.io/threat-heartbeat/CVE-2026-67411/
---

# CVE-2026-67411 RabbitMQ - Authentication Bypass

RabbitMQ 3.13.0 to 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3 contains an authentication bypass caused by loss of proxy-derived client address before loopback\_users check in MQTT components, letting attackers with valid loopback-restricted credentials bypass source-address restrictions, exploit requires valid credentials for loopback-restricted account.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

Proof of concept available

Authentication

Required

EPSS

0.32% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-67411)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

25 September 2026

Updated

15 October 2026

Weakness

[CWE-863](https://cwe.mitre.org/data/definitions/863.html)

## Vendor fix

Update to versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, or 4.3.3 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-2026-67411](https://nvd.nist.gov/vuln/detail/CVE-2026-67411)
- [https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9)
- [https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3)
- [https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-4r6f-9cpw-f6g6](https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-4r6f-9cpw-f6g6)
- [https://github.com/rabbitmq/rabbitmq-server/commit/a7528314840c4f8dc9904684f9f97ffa7aac6349](https://github.com/rabbitmq/rabbitmq-server/commit/a7528314840c4f8dc9904684f9f97ffa7aac6349)
- [https://github.com/rabbitmq/rabbitmq-server/commit/edbead0eabbd65925d0dc914a22d6a29e155e646](https://github.com/rabbitmq/rabbitmq-server/commit/edbead0eabbd65925d0dc914a22d6a29e155e646)

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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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