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CVE-2026-67407 Details

Description

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23, Incomplete fix for CVE-2026-44838: escaperegexchar/1 does not escape -, leaving room for an MQTT topic permission bypass. the CVE-2026-44838 fix made expandtopicpermission/2 escape regex metacharacters in expanded topic-permission variables (escaperegex(V)), but escaperegexchar/1 escapes \ ^ $ . | ? + ( ) [ ] { } and omits -. When a topic permission template places {clientid} inside a [...] character class A low-privileged authenticated MQTT user controlling its clientid can broaden topic authorization (read and write) when templates embed {clientid} in a [...] This issue is fixed in versions 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23.

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/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-q46v-hrvq-hp24	[email protected]	Vendor AdvisoryExploitMitigation

Weakness Enumeration

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

Affected Products

Product	Versions
broadcom rabbitmq server	>= 4.0.0, < 4.0.23 >= 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 16, 2026	Initial Analysis	[email protected]
Sep 25, 2026	CVE Modified	CISA-ADP
Sep 25, 2026	New CVE Received	[email protected]