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CVE-2026-67411

RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
rabbitmq / rabbitmq-serveraffected >= 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

CWE

CWE-863

References

ADP enrichment

CISA-ADP

No English description supplied.