High severity7.1NVD Advisory· Published Sep 25, 2026· Updated Oct 8, 2026
CVE-2026-67412
CVE-2026-67412
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*Range: >=3.13.0,<3.13.18
- Range: >=3.13.0,<4.3.3, >=4.2.9,<4.2.9, >=4.1.14,<4.1.14, >=4.0.24,<4.0.24, >=3.13.18,<3.13.18
Patches
Vulnerability mechanics
References
3- github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qjnvdExploitVendor Advisory
- github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9nvdRelease Notes
- github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3nvdRelease Notes
News mentions
1- RabbitMQ: 25 Vulnerabilities Disclosed Together, Highlighting Auth, UI, and DoS RisksVypr Intelligence · Sep 25, 2026