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CVE-2026-67411

CVE-2026-67411 · RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass

This page contains facts from public vulnerability sources. Check the original advisory before updating.

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.

CVSS 6.0 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system · database

Affected products and versions

  • rabbitmq

    Versions
    • >= 4.3.0, < 4.3.3: Affected
    • >= 4.2.0, < 4.2.9: Affected
    • >= 4.1.0, < 4.1.14: Affected
    • >= 4.0.0, < 4.0.23: Affected
    • >= 3.13.0, < 3.13.18: Affected

    No fix published

  • rabbitmq-server Debian:12

    Versions
    • 3.10.8-1.1
    • 3.10.8-1.1+deb12u1
    • 3.10.8-2
    • 3.10.8-3
    • 3.10.8-4
    • 3.12.1-1
    • 3.12.1-1.1
    • 4.0.5-1
    • 4.0.5-10
    • 4.0.5-11
    • 4.0.5-12
    • 4.0.5-13
    • 4.0.5-14
    • 4.0.5-2
    • 4.0.5-3
    • 4.0.5-4
    • 4.0.5-5
    • 4.0.5-6
    • 4.0.5-8
    • 4.0.5-9
    • 4.3.0-1
    • 4.3.0-2
    • 4.3.0-3
    • 4.3.2-1
    • 4.3.2-2
    • 4.3.2-3
    • 4.3.2-4
    • 4.3.2-5
    • 4.3.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Debian:13

    Versions
    • 4.0.5-10
    • 4.0.5-11
    • 4.0.5-12
    • 4.0.5-13
    • 4.0.5-14
    • 4.0.5-6
    • 4.0.5-6+deb13u1
    • 4.0.5-6+deb13u2
    • 4.0.5-8
    • 4.0.5-9
    • 4.3.0-1
    • 4.3.0-2
    • 4.3.0-3
    • 4.3.2-1
    • 4.3.2-2
    • 4.3.2-3
    • 4.3.2-4
    • 4.3.2-5
    • 4.3.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Debian:14

    Versions
    • 4.0.5-10
    • 4.0.5-11
    • 4.0.5-12
    • 4.0.5-13
    • 4.0.5-14
    • 4.0.5-6
    • 4.0.5-8
    • 4.0.5-9
    • 4.3.0-1
    • 4.3.0-2
    • 4.3.0-3
    • 4.3.2-1
    • 4.3.2-2
    • 4.3.2-3
    • 4.3.2-4
    • 4.3.2-5
    Affected ranges
    • ECOSYSTEM: < 4.3.6-1

    Update to 4.3.6-1

  • rabbitmq-server Ubuntu:Pro:16.04:LTS

    Versions
    • 3.5.4-1
    • 3.5.4-3
    • 3.5.4-3.1
    • 3.5.7-1
    • 3.5.7-1ubuntu0.16.04.1
    • 3.5.7-1ubuntu0.16.04.2
    • 3.5.7-1ubuntu0.16.04.4
    • 3.5.7-1ubuntu0.16.04.4+esm1
    • 3.5.7-1ubuntu0.16.04.4+esm2
    • 3.5.7-1ubuntu0.16.04.4+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Ubuntu:Pro:18.04:LTS

    Versions
    • 3.6.10-1
    • 3.6.10-1ubuntu0.1
    • 3.6.10-1ubuntu0.3
    • 3.6.10-1ubuntu0.4
    • 3.6.10-1ubuntu0.5
    • 3.6.10-1ubuntu0.5+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Ubuntu:Pro:20.04:LTS

    Versions
    • 3.7.8-4ubuntu2
    • 3.7.18-1
    • 3.8.2-0ubuntu1
    • 3.8.2-0ubuntu1.1
    • 3.8.2-0ubuntu1.2
    • 3.8.2-0ubuntu1.3
    • 3.8.2-0ubuntu1.4
    • 3.8.2-0ubuntu1.5
    • 3.8.3-0ubuntu0.1
    • 3.8.3-0ubuntu0.2
    • 3.8.3-0ubuntu0.3
    • 3.8.3-0ubuntu0.3+esm1
    • 3.8.3-0ubuntu0.3+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Ubuntu:22.04:LTS

    Versions
    • 3.8.9-3ubuntu1
    • 3.9.8-1
    • 3.9.8-2
    • 3.9.8-3
    • 3.9.8-5
    • 3.9.8-6
    • 3.9.13-1
    • 3.9.13-1ubuntu0.22.04.1
    • 3.9.13-1ubuntu0.22.04.2
    • 3.9.27-0ubuntu0.1
    • 3.9.27-0ubuntu0.2
    • 3.9.27-0ubuntu0.5
    • 3.9.27-0ubuntu0.6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Ubuntu:24.04:LTS

    Versions
    • 3.12.1-1
    • 3.12.1-1ubuntu1
    • 3.12.1-1ubuntu1.2
    • 3.12.1-1ubuntu1.4
    • 3.12.1-1ubuntu1.6
    • 3.12.1-1ubuntu1.7
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Ubuntu:26.10

    Versions
    • 4.0.5-10ubuntu5
    • 4.3.2-4ubuntu2
    • 4.3.2-4ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rabbitmq-server Ubuntu:26.04:LTS

    Versions
    • 4.0.5-8ubuntu2
    • 4.0.5-10ubuntu1
    • 4.0.5-10ubuntu2
    • 4.0.5-10ubuntu3
    • 4.0.5-10ubuntu4
    • 4.0.5-10ubuntu5
    • 4.0.5-10ubuntu5.1
    • 4.0.5-10ubuntu5.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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