---
id: CVE-2026-67241
title: RabbitMQ is a messaging and streaming broker
summary: >-
  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 ex…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N'
cwe:
  - CWE-862
vendor: rabbitmq
product: rabbitmq-server
affected:
  - 'rabbitmq-server >= 4.2.0, < 4.2.9'
  - 'rabbitmq-server >= 4.3.0, < 4.3.3'
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:17:12.180'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67241'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/18eac8d547b4382bf830c621b20a35932dd1cfa5
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/56005e7cebffc478ef397573de24aff1167e7cda
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-rg2g-289m-xhhw
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-25T17:13:14.027Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.