---
id: CVE-2026-67236
title: RabbitMQ is a messaging and streaming broker
summary: >-
  RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and
  4.3.2, a successful POST /login caused is_authorized/2 to set an auth cookie
  containing base64-encoded username:password credentials without HttpOnly,
  Secure, SameS…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-312
vendor: broadcom
product: rabbitmq_server
affected:
  - 'rabbitmq_server >= 4.2.0, < 4.2.8'
  - 'rabbitmq_server >= 4.3.0, < 4.3.2'
patched:
  - rabbitmq_server 4.3.2
published: '2026-09-25'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T20:24:24.710'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67236'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/df9e7f4c0afd311a672705f020d301efad355745
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/edf1fbc7217aaf736955d2e13c9534901a2e0778
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-88vh-gx85-p36m
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67236.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-67236'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541491'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-67236'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67236'
  - url: 'https://access.redhat.com/errata/RHSA-2026:67552'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00166
epssPercentile: 0.05828
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T13:41:31.815135Z'
scores:
  nvd: 6.5
  cna: 8.2
  vendor: 5.3
ingestedAt: '2026-09-25T16:12:08.723Z'
---

## Overview

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, a successful POST /login caused is_authorized/2 to set an auth cookie containing base64-encoded username:password credentials without HttpOnly, Secure, SameSite, or expiration protections. Because base64 is encoding rather than encryption, an attacker with same-origin cross-site scripting, an HTTP-readable network position, or local access to the browser cookie store could recover the actual login credentials; older browsers that treated an absent SameSite attribute as None also sent the cookie cross-site. This issue is fixed in versions 4.2.8 and 4.3.2.

## Affected

- `rabbitmq_server >= 4.2.0, < 4.2.8`
- `rabbitmq_server >= 4.3.0, < 4.3.2`

## Remediation

Upgrade past the affected range:

- `rabbitmq_server 4.3.2`

## 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 · no fix planned: Red Hat Hardened Images · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67236.json)