Disclosure summary
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.
Source-reported weakness categories
CWE-863
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-67411
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| broadcom | rabbitmq_server | * {"versionStartIncluding":"4.3.0","versionEndExcluding":"4.3.3"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Patch
- github.com — Patch
- github.com — Release Notes
- github.com — Release Notes
- github.com — Exploit, Vendor Advisory
- github.com — Exploit, Vendor Advisory
PUBLISHED 2026-09-25T13:17:13-04:00
MODIFIED 2026-10-08T12:46:06-04:00
INGESTED 2026-10-10T20:50:44-04:00