CVE-2026-66070: Rabbitmq Rabbitmq-Server

High severity, CVSS 7.6. EPSS: 0.4% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.17, 4.0.22, 4.1.13, and 4.2.6, match_origin/1 returned the bare reflected Origin and allowed credentials even when the wildcard "" was configured, so the response echoed the attacker's origin together with Access-Control-Allow-Credentials. The affected code is rabbit_mgmt_cors.erl. When the management plugin is configured with a wildcard CORS origin (cors_allow_origins = ""), the handler reflects the request Origin back in Access-Control-Allow-Origin and also sends Access-Control-Allow-Credentials: true. A malicious web page that a signed-in administrator visits can then use that administrator's cached HTTP Basic credentials to issue authenticated, state-changing requests to the management API. Preconditions include The management plugin is configured with the wildcard cors_allow_origins = "*", which is an explicit operator misconfiguration A target administrator has a cached HTTP Basic-auth session in the browser. This issue is fixed in versions 3.13.17, 4.0.22, 4.1.13, and 4.2.6.

Affected products

• Rabbitmq Rabbitmq-Server: from 3.13.0, before 3.13.17 (fixed in 3.13.17); from 4.0.0, before 4.0.22 (fixed in 4.0.22); from 4.1.0, before 4.1.13 (fixed in 4.1.13); from 4.2.0, before 4.2.6 (fixed in 4.2.6)

Published 2026-09-23. Last modified 2026-09-24.