CVE-2026-67411

Summary

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.

Affected Software

VendorProductVersion RangeStatus
rabbitmqrabbitmq-server>= 4.3.0, < 4.3.3affected
rabbitmqrabbitmq-server>= 4.2.0, < 4.2.9affected
rabbitmqrabbitmq-server>= 4.1.0, < 4.1.14affected
rabbitmqrabbitmq-server>= 4.0.0, < 4.0.23affected
rabbitmqrabbitmq-server>= 3.13.0, < 3.13.18affected

Weaknesses

  • CWE-863: CWE-863: Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

Additional References

References