CVE-2026-67411

highpriority · track · 28OT risk · elevatedEPSS 0.003 · 25 %ileUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.32% (25th) EPSS

CVSS 7.1 · high

Is it mine?

10 products

Check your exposure

Who says so?

2 sources

osv · nvd

EPSS · scored 2026-10-27

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.

cvss

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

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 2.3–7.1

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 4.2

v4.06mediumCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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

v4.02.3lowCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USprimary

affected products (10)

Products and version ranges known to be affected.

broadcom rabbitmq server3.13.0 → 3.13.18nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.0.0 → 4.0.23nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.1.0 → 4.1.14nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.2.0 → 4.2.9nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.3.0 → 4.3.3nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
Bitnami rabbitmq3.13.0 → 3.13.18osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.0.0 → 4.0.23osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.1.0 → 4.1.14osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.2.0 → 4.2.9osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.3.0 → 4.3.3osvUSpkg:bitnami/rabbitmq

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-rabbitmq-2026-67411RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass2026-10-01vendor · osvUS
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.

also known as (1)

Other names and identifiers for this entity.

GHSA-4r6f-9cpw-f6g6 osv

sources

Which sources assert this record, and when.

osv nvd NVD CVE.org MITRE

published 2026-09-25modified 2026-10-08

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+5006 more

references (5) nvd

External citations — patches, advisories, analysis.

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