Vulnerability Details CVE-2026-66076
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 17.3%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-66076
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.0
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.1
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.10
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.11
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.12
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.13
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.14
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.15
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.16
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.17
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.18
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.19
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.2
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.3
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.4
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.5
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.6
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.7
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.8
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.9
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cpe:2.3:a:broadcom:rabbitmq_server:4.2.0
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cpe:2.3:a:broadcom:rabbitmq_server:4.2.1
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cpe:2.3:a:broadcom:rabbitmq_server:4.2.2
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cpe:2.3:a:broadcom:rabbitmq_server:4.2.3
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cpe:2.3:a:broadcom:rabbitmq_server:4.2.4
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cpe:2.3:a:broadcom:rabbitmq_server:4.2.5