Authorization Bypass in RabbitMQ Messaging and Streaming Broker
CVE-2026-57221

5.3MEDIUM

Key Information:

Vendor

RabbitMQ

Status
RabbitMQ-server
Vendor
CVE Published:
10 July 2026

What is CVE-2026-57221?

A vulnerability in RabbitMQ allows authenticated users to bypass authorization checks during passive queue and exchange declarations. Specifically, users can enumerate queue and exchange names and retrieve message and consumer counts. This issue exists in RabbitMQ versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6 and has been addressed in the respective updates, enhancing the security of the messaging and streaming broker.

Affected Version(s)

rabbitmq-server >= 4.2.0, < 4.2.6 < 4.2.0, 4.2.6

rabbitmq-server >= 4.1.0, < 4.1.11 < 4.1.0, 4.1.11

rabbitmq-server >= 4.0.0, < 4.0.21 < 4.0.0, 4.0.21

References

https://github.com/rabbitmq/rabbitmq-server/security/advi...
x_refsource_CONFIRM
https://github.com/rabbitmq/rabbitmq-server/pull/16085
x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-server/pull/16090
x_refsource_MISC

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.