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CVE-2026-67412 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj	CISA-ADP	ExploitVendor Advisory
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9	[email protected]	Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3	[email protected]	Release Notes
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj	[email protected]	ExploitVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-862	Missing Authorization	[email protected]

Affected Products

Product	Versions
broadcom rabbitmq server	>= 3.13.0, < 3.13.18 >= 4.0.0, < 4.0.24 >= 4.1.0, < 4.1.14 >= 4.2.0, < 4.2.9 >= 4.3.0, < 4.3.3
CPE cpe:2.3:a:broadcom:rabbitmq_server:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 8, 2026	Initial Analysis	[email protected]
Sep 25, 2026	New CVE Received	[email protected]
Sep 25, 2026	CVE Modified	CISA-ADP