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CVE-2026-67407

7.1 · HIGH

RabbitMQ is a messaging and streaming broker.

Published Sep 25, 2026broadcomCWE-862EPSS 0.26%

Overview

CVE-2026-67407 is a high-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 25, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from broadcom. Update rabbitmq_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
broadcomrabbitmq_server>= 4.0.0, < 4.0.23Affected

References

GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3GitHubgithub.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q46v-hrvq-hp24

How CyberStrike helps

Frequently asked questions

What is CVE-2026-67407?

CVE-2026-67407 is a high-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 25, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-67407?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-67407?

Check the references section for vendor advisories and patches from broadcom. Update rabbitmq_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-67407?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-67407 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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