Input validation error in RabbitMQ Server - #VU137287
Published: July 10, 2026
Vulnerability identifier: #VU137287
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause integrity issues by causing a stale authentication-mechanism preference to persist across logout.
The vulnerability exists due to improper input validation in get_auth_mechanism/1 when clearing the consumed auth-mechanism cookie. A remote attacker can trigger the application to send a malformed Set-Cookie header with a non-conformant cookie name to cause integrity issues by causing a stale authentication-mechanism preference to persist across logout.
User interaction is required, and the issue is limited to weak session hygiene in browser-based use, such as shared-browser scenarios.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.2.8, 4.3.2