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CVE-2026-67405

8.1 · HIGH

RabbitMQ is a messaging and streaming broker.

Published Sep 23, 2026broadcomCWE-1385EPSS 0.11%

Overview

CVE-2026-67405 is a high-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 23, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, Neither the Web-MQTT handler (deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl:104) nor the Web-STOMP handler (deps/rabbitmq_web_stomp/src/rabbit_web_stomp_handler.erl:102) validates the Origin header on the WebSocket upgrade. Under ssl_cert_login=true, the browser presents the client certificate automatically, so an attacker's JavaScript running in the victim's browser can authenticate as the victim. Preconditions include The non-default configuration use_http_auth=true (Web-STOMP) or ssl_cert_login=true (both plugins) must be enabled. The issue is harmless under the default in-band CONNECT credential configuration.. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.

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>= 3.13.0, < 3.13.15Affected

References

GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0GitHubgithub.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-9c4f-rxxm-88q3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-67405?

CVE-2026-67405 is a high-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 23, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-67405?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-67405?

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-2026-67405?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-67405 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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