Bug 2539721 (CVE-2026-66076)

Summary: CVE-2026-66076 rabbitmq: RabbitMQ: Information disclosure via cross-vhost authorization bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in RabbitMQ. An authorization bypass vulnerability allows a management-tagged user to read Raft status, including leader, members, term, and commit index, for quorum queues in inaccessible virtual hosts (vhosts). This exposes sensitive cross-tenant queue names and cluster topology information. This issue occurs when the management plugin is enabled.
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Description OSIDB Bzimport 2026-09-23 20:12:08 UTC 
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, is_authorized/2 calls rabbit_mgmt_util:is_authorized/2, which checks only the management tag, instead of is_authorized_vhost/2. The /api/queues/quorum/:vhost/:queue/status handler reads the vhost from the path without checking that the user can access it. Any management-tagged user can therefore read Raft status, including leader, members, term, and commit index, for quorum queues in inaccessible vhosts, exposing cross-tenant queue names and cluster topology. The management plugin must be enabled and the attacker must have a management tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.