CVE-2026-67405

RabbitMQ: CSWSH on Web-STOMP / Web-MQTT (no Origin validation)

State: Published
Severity: 5.3 Medium
Published: Sep 23, 2026
Updated: Sep 24, 2026
Reserved: Jul 29, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N	GitHub_M

Weaknesses

CWE-1385 Missing Origin Validation in WebSockets

Affected Products

Product	Versions
rabbitmq-serverrabbitmq	>= 3.13.0, < 3.13.15Affected >= 4.0.0, < 4.0.20Affected >= 4.1.0, < 4.1.11Affected >= 4.2.0, < 4.2.6Affected

References

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