CVE-2026-67412

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

State: Published
Severity: 6.0 Medium
Published: Sep 25, 2026
Updated: Sep 25, 2026
Reserved: Jul 29, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N	GitHub_M

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
rabbitmq-serverrabbitmq	>= 4.3.0, < 4.3.3Affected >= 4.2.0, < 4.2.9Affected >= 4.1.0, < 4.1.14Affected >= 4.0.0, < 4.0.24Affected >= 3.13.0, < 3.13.18Affected

References

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