Cleartext storage of sensitive information in RabbitMQ Server - #VU137288
Published: July 10, 2026
Vulnerability identifier: #VU137288
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-312
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to cleartext storage of sensitive information in the management UI login cookie when processing successful POST /login requests. A remote attacker can obtain the auth cookie value to disclose sensitive information.
The cookie stores the user's actual username and password in base64 form rather than a session token, and it is readable from JavaScript because it is set without the HttpOnly attribute.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.2.8, 4.3.2