Vulnerability Description
RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, a successful POST /login caused is_authorized/2 to set an auth cookie containing base64-encoded username:password credentials without HttpOnly, Secure, SameSite, or expiration protections. Because base64 is encoding rather than encryption, an attacker with same-origin cross-site scripting, an HTTP-readable network position, or local access to the browser cookie store could recover the actual login credentials; older browsers that treated an absent SameSite attribute as None also sent the cookie cross-site. This issue is fixed in versions 4.2.8 and 4.3.2.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Broadcom | Rabbitmq Server | >= 4.2.0, < 4.2.8 |
Related Weaknesses (CWE)
References
- https://github.com/rabbitmq/rabbitmq-server/commit/df9e7f4c0afd311a672705f020d30Patch
- https://github.com/rabbitmq/rabbitmq-server/commit/edf1fbc7217aaf736955d2e13c953Patch
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8Release Notes
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2Release Notes
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-88vh-gx85-pExploitThird Party Advisory
FAQ
What is CVE-2026-67236?
CVE-2026-67236 is a vulnerability with a CVSS score of 6.5 (MEDIUM). RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, a successful POST /login caused is_authorized/2 to set an auth cookie containing base64-encoded username:password creden...
How severe is CVE-2026-67236?
CVE-2026-67236 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67236?
Check the references section above for vendor advisories and patch information. Affected products include: Broadcom Rabbitmq Server.