CVE-2026-67412 RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message access
A policymaker on one vhost can read and delete messages from another vhost without permission, breaking tenant isolation in RabbitMQ.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67412?
CVE-2026-67412 is a medium-severity missing authorization vulnerability in Broadcom Rabbitmq Server, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-67412?
1 open source package ship an affected version, including rabbitmq. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
rabbitmq Bitnami | From 3.13.0 | 3.13.18, 4.0.24, 4.1.14, 4.2.9, 4.3.3 |
Products include Broadcom Rabbitmq Server.
How do I fix CVE-2026-67412?
Upgrade rabbitmq to a fixed version for your release line: 3.13.18, 4.0.24, 4.1.14 or 4.2.9.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-67412 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67412 exists.
Other vulnerabilities in Broadcom Rabbitmq Server
- CVE-2016-9877 Auth bypass in Pivotal RabbitMQ 3.x before 3.5.8 and 3.6.x before 3.6.6; RabbitMQ for PCF 1.5.x before 1.5.20, 1.6.x before 1.6.12 and 1.7.x before 1.7.7
- CVE-2026-67404 RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch
- CVE-2026-67231 RabbitMQ: Trust-store whitelist by Issuer+Serial only
- CVE-2026-57219 Information disclosure in rabbitmq-server
- CVE-2026-67236 RabbitMQ: Plaintext username:password stored in an insecure cookie after successful POST /login
Sources
Also known as AZL-105284, BIT-rabbitmq-2026-67412, DEBIAN-CVE-2026-67412, GHSA-42pc-678q-v8qj, UBUNTU-CVE-2026-67412.