Missing Authorization Affecting rabbitmq-server package, versions <4.3.6-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.35% (27th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-RABBITMQSERVER-20146918
  • published26 Sept 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

NewCVE-2026-67241  (opens in a new tab)
CWE-862  (opens in a new tab)

How to fix?

Upgrade Debian:unstable rabbitmq-server to version 4.3.6-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rabbitmq-server package and not the rabbitmq-server package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.9 and 4.3.3, AMQP 1.0 management exchange.declare skips alternate-exchange permission check. pUT /exchanges/:name (lines 192-240) checks only configure on the declared exchange and passes XArgs straight to rabbitexchange:declare/7. It omits the checkreadpermitted(X) + checkwritepermitted(AE) that rabbitchannel.erl:2540-2548 enforces for the alternate-exchange argument on the AMQP 0-9-1 path. The same file already implements the analogous DLX check for queues (lines 708-719), confirming this is a missing-check bug rather than intentional A user with only configure on exchange X can route X's unroutable messages into an alternate exchange they have no write permission AMQP 1.0 enabled (default in RabbitMQ 4.x) Attacker has configure on at least one exchange but lacks write on the target. This issue is fixed in versions 4.2.9 and 4.3.3.

CVSS Base Scores

version 3.1