CVE-2026-67405

highpriority · track · 32EPSS 0.001 · 1 %ileDEUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.11% (1st) EPSS

CVSS 8.1 · high

Is it mine?

19 products

Check your exposure

Who says so?

3 sources

osv · cert_bund · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 1.3–8.1

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 5.2

v4.05.3mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · security-advisories@github.com

v4.01.3lowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1385US

affected products (19)

Products and version ranges known to be affected.

Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Open Source Open Source RabbitMQ <3.13.15< 3.13.15cert_bundDE
Open Source Open Source RabbitMQ <4.0.22< 4.0.22cert_bundDE
Open Source Open Source RabbitMQ <4.1.11< 4.1.11cert_bundDE
Open Source Open Source RabbitMQ <4.2.8< 4.2.8cert_bundDE
Open Source Open Source RabbitMQ <4.3.2< 4.3.2cert_bundDE
Open Source RabbitMQ< 3.13.15cert_bundDE
Open Source RabbitMQ< 4.0.22cert_bundDE
Open Source RabbitMQ< 4.1.11cert_bundDE
Open Source RabbitMQ< 4.2.8cert_bundDE
Open Source RabbitMQ< 4.3.2cert_bundDE
broadcom rabbitmq server3.13.0 → 3.13.15nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.0.0 → 4.0.20nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.1.0 → 4.1.11nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.2.0 → 4.2.6nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
Bitnami rabbitmq3.13.0 → 3.13.15osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.0.0 → 4.0.20osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.1.0 → 4.1.11osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.2.0 → 4.2.6osvUSpkg:bitnami/rabbitmq

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2268RabbitMQ: Mehrere SchwachstellenDeutsch2026-07-09csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in RabbitMQ ausnutzen, um beliebigen Programmcode auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.
BIT-rabbitmq-2026-67405RabbitMQ: CSWSH on Web-STOMP / Web-MQTT (no Origin validation)2026-10-01vendor · osvUS
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.

also known as (1)

Other names and identifiers for this entity.

GHSA-9c4f-rxxm-88q3 osv

sources

Which sources assert this record, and when.

osv cert_bund nvd NVD CVE.org MITRE

published 2026-09-23modified 2026-10-19

references (3) nvd

External citations — patches, advisories, analysis.

https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0Release Notes
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-9c4f-rxxm-88q3Vendor Advisory

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