CVE-2026-67421

rabbitmq-server: RabbitMQ is a messaging and streaming broker

CVE-2026-67421 is fixed in rabbitmq-server on 1 platform by DEBIAN-CVE-2026-67421 (version 4.3.6-1), released October 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine
CVSS
6.8
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0028
20th percentile

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, RabbitMQ Management rendered an AMQP authorization-error reason containing an attacker-controlled queue name as HTML when the OAuth management UI was enabled. Exploitation requires an attacker with queue configure permission, a management administrator who can see but cannot read that queue, and the administrator clicking Get Message(s). A queue name containing a base element can then retarget the automatic relative refresh because the Content Security Policy omits base-uri and connect-src, and an attacker endpoint that permits the management origin through CORS can receive the victim's Authorization header. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.

Where it's fixed

ProductFixed inFixReleased
Linux
rabbitmq-server · Debian 14 4.3.6-1 DEBIAN-CVE-2026-67421 Oct 10, 2026

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