CVE-2026-67237: Rabbitmq Rabbitmq-Server

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, set_token_auth/2 inserted a bearer token from the Authorization header or access_token cookie into OAuth bootstrap JavaScript without escaping, allowing attacker-controlled token content to execute JavaScript in the management UI origin. The endpoint is exposed before authentication only when management.oauth_enabled is true, and exploitation through the cookie path additionally requires the attacker to plant an access_token cookie on the management host. This issue is fixed in versions 4.2.8 and 4.3.2.

Affected products

• Rabbitmq Rabbitmq-Server: from 4.2.0, before 4.2.8 (fixed in 4.2.8); from 4.3.0, before 4.3.2 (fixed in 4.3.2)

Published 2026-09-25. Last modified 2026-09-28.