CVE-2026-67412

The RabbitMQ messaging and streaming broker is vulnerable to a cross-vhost authorization bypass in its Federation upstream feature. Specifically, the system validates the upstream URI without enforcing vhost-access checks. This allows a policymaker with privileges on one vhost to read and drain (...

CVE-2026-67412 RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message access

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...