CVE-2026-67412: Broadcom Rabbitmq Server

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9 , 4.1.14, 4.0.24, and 3.13.18, Federation upstream in RabbitMQ skips vhost authorization allowing cross-vhost message access. what the bug lets you do. A policymaker on one vhost reads and drains messages out of another vhost it has no permission on. With the default ack-mode the source messages are consumed (deleted), not copied. Why that should not 1. Federation validates the upstream URI without any vhost-access Cross-vhost message read/drain from a per-vhost policymaker, breaking vhost tenancy This issue is fixed in versions 4.3.3, 4.2.9 , 4.1.14, 4.0.24, and 3.13.18.

Affected products

• Broadcom Rabbitmq Server: from 3.13.0, before 3.13.18 (fixed in 3.13.18); from 4.0.0, before 4.0.24 (fixed in 4.0.24); from 4.1.0, before 4.1.14 (fixed in 4.1.14); from 4.2.0, before 4.2.9 (fixed in 4.2.9); from 4.3.0, before 4.3.3 (fixed in 4.3.3)

Published 2026-09-25. Last modified 2026-10-08.