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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
rabbitmq rabbitmq-server affected
Version Status Constraints
>= 4.3.0, < 4.3.3 affected —
>= 4.2.0, < 4.2.9 affected —
>= 4.1.0, < 4.1.14 affected —
>= 4.0.0, < 4.0.24 affected —
>= 3.13.0, < 3.13.18 affected —

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 cve-icon cve-icon
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 cve-icon cve-icon
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj cve-icon cve-icon
History

Fri, 25 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message access
Weaknesses CWE-862
References
Metrics cvssV4_0

{'score': 6, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-25T16:45:00.348Z

Reserved: 2026-07-29T15:02:20.412Z

Link: CVE-2026-67412

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-25T17:17:13.393

Modified: 2026-09-25T17:17:13.393

Link: CVE-2026-67412

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-25T18:45:17Z

Weaknesses