---
id: CVE-2026-67421
title: RabbitMQ is a messaging and streaming broker
summary: >-
  RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19,
  4.0.24, 4.1.15, 4.2.10, and 4.3.5, RabbitMQ Management rendered an AMQP
  authorization-error reason containing an attacker-controlled queue name as
  HTML when the OAu…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-862
  - CWE-79
vendor: broadcom
product: rabbitmq_server
affected:
  - 'rabbitmq_server >= 3.13.0, < 3.13.9'
  - 'rabbitmq_server >= 4.0.0, < 4.0.24'
  - 'rabbitmq_server >= 4.1.0, < 4.1.15'
  - 'rabbitmq_server >= 4.2.0, < 4.2.10'
  - 'rabbitmq_server >= 4.3.0, < 4.3.5'
patched:
  - rabbitmq_server 4.3.5
published: '2026-09-25'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T19:53:05.337'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67421'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/ff595eaaa6d4f580f72fa04801ffd35f48c46027
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5'
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-6256-27fm-4rgr
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-6256-27fm-4rgr
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67421.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-67421'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541533'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-67421'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67421'
  - url: 'https://access.redhat.com/errata/RHSA-2026:67552'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.0028
epssPercentile: 0.20362
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-25T19:57:04.069632Z'
scores:
  nvd: 6.8
  cna: 4.5
  vendor: 4.4
ingestedAt: '2026-09-25T17:13:14.019Z'
---

## Overview

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, RabbitMQ Management rendered an AMQP authorization-error reason containing an attacker-controlled queue name as HTML when the OAuth management UI was enabled. Exploitation requires an attacker with queue configure permission, a management administrator who can see but cannot read that queue, and the administrator clicking Get Message(s). A queue name containing a base element can then retarget the automatic relative refresh because the Content Security Policy omits base-uri and connect-src, and an attacker endpoint that permits the management origin through CORS can receive the victim's Authorization header. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.

## Affected

- `rabbitmq_server >= 3.13.0, < 3.13.9`
- `rabbitmq_server >= 4.0.0, < 4.0.24`
- `rabbitmq_server >= 4.1.0, < 4.1.15`
- `rabbitmq_server >= 4.2.0, < 4.2.10`
- `rabbitmq_server >= 4.3.0, < 4.3.5`

## Remediation

Upgrade past the affected range:

- `rabbitmq_server 4.3.5`

## Vendor advisories

- **RHSA-2026:67552** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67552)
- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · no fix planned: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat Hardened Images, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67421.json)