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CVE-2026-57221 is a missing authorization flaw in RabbitMQ affecting AMQP 0-9-1 passive queue.declare and exchange.declare operations. In affected versions, RabbitMQ fails to enforce the required authorization checks when a client performs passive declarations, allowing any authenticated user who can connect to a virtual host, including an account with effectively zero permissions, to test for the existence of queues and exchanges by known or guessed name and retrieve associated metadata. Exposed metadata includes queue and exchange names as well as queue message counts and consumer counts. The issue weakens tenant isolation and enables unauthorized visibility into messaging topology and operational state, particularly in shared or multi-tenant deployments.
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No public exploit code observed for this vulnerability.
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A medium-severity authorization bypass in RabbitMQ that lets any authenticated user bypass tenant isolation and read queue and exchange statistics across virtual hosts, enabling reconnaissance.
Medium-severity RabbitMQ information disclosure vulnerability that allows an authenticated attacker without proper permissions to enumerate queues and exchanges and obtain their statistics.
A missing authorization vulnerability in RabbitMQ that allows authenticated users to bypass tenant boundaries and read metadata about other tenants' queues and exchanges within a virtual host regardless of permissions.
A missing authorization check in RabbitMQ that allows an authenticated but unauthorized user to enumerate queue or exchange metadata, leaking cross-tenant operational information in multi-tenant environments.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.