Improper Authorization in RabbitMQ Server - CVE-2026-57218
Published: June 25, 2026 / Updated: June 25, 2026
Vulnerability identifier: #VU135150
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57218
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose queue messages after authorization has been revoked.
The vulnerability exists due to improper access control in the AMQP 0-9-1 consumer authorization flow when processing message deliveries after OAuth token expiry or scope downgrade via connection.update_secret. A remote user can maintain a previously established consumer and refresh to a token with reduced queue read scope to disclose queue messages after authorization has been revoked.
The issue is limited to already-established AMQP 0-9-1 consumer flows; creating a new consumer after the downgrade is denied, while the pre-existing consumer can still receive new messages.
Affected software
RabbitMQ Server
How to mitigate CVE-2026-57218
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.2.6, 4.3.0