CVE-2026-57216 Auth bypass in rabbitmq-server
Remote attackers can bypass loopback restrictions to connect as guest users via trusted proxy paths in RabbitMQ.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57216?
CVE-2026-57216 is a medium-severity authentication bypass vulnerability in Broadcom Rabbitmq Server, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-57216?
It affects 1 product.
Products include Broadcom Rabbitmq Server.
How do I fix CVE-2026-57216?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-57216 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57216 exists.
Other vulnerabilities in Broadcom Rabbitmq Server
- CVE-2016-9877 Auth bypass in Pivotal RabbitMQ 3.x before 3.5.8 and 3.6.x before 3.6.6; RabbitMQ for PCF 1.5.x before 1.5.20, 1.6.x before 1.6.12 and 1.7.x before 1.7.7
- CVE-2026-67404 RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch
- CVE-2026-67231 RabbitMQ: Trust-store whitelist by Issuer+Serial only
- CVE-2026-57219 Information disclosure in rabbitmq-server
- CVE-2026-67236 RabbitMQ: Plaintext username:password stored in an insecure cookie after successful POST /login
Sources
Also known as AZL-92349, DEBIAN-CVE-2026-57216, GHSA-36m6-588r-vqcw, UBUNTU-CVE-2026-57216.