CVE-2026-67412

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	rabbitmq
Product	rabbitmq-server
Published	Sep 25, 2026
Last Updated	Sep 25, 2026

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Affected Versions

rabbitmq / rabbitmq-server

>= 4.3.0, < 4.3.3 >= 4.2.0, < 4.2.9 >= 4.1.0, < 4.1.14 >= 4.0.0, < 4.0.24 >= 3.13.0, < 3.13.18

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj github.com: https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 github.com: https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3