CVE-2026-67412

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

Published: Sep 25, 2026Updated: Sep 25, 2026 Sources: CVE List NVDCWE-862

N/ACVSS

NVD MITRE

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.

No summary for this CVE yet.

Weaknesses

CWE-862

Affected Products

rabbitmq

oss-project·GBaka rabbitmq-server

rabbitmq-serverOn-prem

Databases / cache-message-queue

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

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

github.com

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