CVE-2026-57216
MEDIUMRabbitMQ PROXY Protocol Path - Remote Guest Session Authentication Bypass
Title source: manualDescription
RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, AMQP 0-9-1, AMQP 1.0, and Stream Protocol authentication can allow a loopback-restricted user such as guest to connect remotely when traffic is accepted through a trusted PROXY-protocol path and the backend listener is loopback-bound because the loopback check uses the listener-side socket address instead of the real client source. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.
References (6)
Core 6
Core References
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https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-36m6-588r-vqcw
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https://github.com/rabbitmq/rabbitmq-server/pull/15936
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https://github.com/rabbitmq/rabbitmq-server/pull/15940
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https://github.com/rabbitmq/rabbitmq-server/commit/7273c9eb6920abcde17b892dbe97ccaf906ead47
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https://github.com/rabbitmq/rabbitmq-server/commit/9f8c39fcf0acbc43080ee7017a62a02832114112
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https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6
Scores
CVSS v3
6.8
EPSS
0.0034
EPSS Percentile
26.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-287
Status
published
Products (5)
broadcom/rabbitmq_server
3.13.0 - 4.2.6
rabbitmq/rabbitmq-server
>= 3.13.0, < 3.13.15
rabbitmq/rabbitmq-server
>= 4.0.0, < 4.0.21
rabbitmq/rabbitmq-server
>= 4.1.0, < 4.1.11
rabbitmq/rabbitmq-server
>= 4.2.0, < 4.2.6
Published
Jul 10, 2026
Tracked Since
Jul 11, 2026