CVE-2026-67236

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.

• CWE-312

• https://github.com/rabbitmq/rabbitmq-server/commit/df9e7f4c0afd311a672705f020d301efad355745Patch
• https://github.com/rabbitmq/rabbitmq-server/commit/edf1fbc7217aaf736955d2e13c9534901a2e0778Patch
• 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-p36mExploit, Third Party Advisory

Published

Sep 25, 2026

Last Modified

Oct 15, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-67230RabbitMQ is a messaging and streaming broker. From 3.13.0 un…7.5
• CVE-2026-67231RabbitMQ is a messaging and streaming broker. Prior to versi…9.1
• CVE-2026-67232RabbitMQ is a messaging and streaming broker. Prior to versi…7.5
• CVE-2026-67233RabbitMQ is a messaging and streaming broker. Prior to versi…7.1
• CVE-2026-67234RabbitMQ is a messaging and streaming broker. From 4.2.0 unt…4.3
• CVE-2026-67235RabbitMQ is a messaging and streaming broker. Prior to versi…6.5
• CVE-2026-67237RabbitMQ is a messaging and streaming broker. From 4.2.0 unt…9.3
• CVE-2026-67238RabbitMQ is a messaging and streaming broker. Prior to versi…6.5
• CVE-2026-67239RabbitMQ is a messaging and streaming broker. From 3.13.0 un…5.4
• CVE-2026-67240RabbitMQ is a messaging and streaming broker. Prior to versi…6.5
• CVE-2026-67241RabbitMQ is a messaging and streaming broker. From 4.2.0 unt…6.5
• CVE-2026-67242RabbitMQ is a messaging and streaming broker. From 4.2.0 unt…5.4