CVE-2026-66070

Summary

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 Software

VendorProductVersion RangeStatus
rabbitmqrabbitmq-server>= 3.13.0, < 3.13.17affected
rabbitmqrabbitmq-server>= 4.0.0, < 4.0.22affected
rabbitmqrabbitmq-server>= 4.1.0, < 4.1.13affected
rabbitmqrabbitmq-server>= 4.2.0, < 4.2.6affected

Weaknesses

  • CWE-942: CWE-942: Permissive Cross-domain Policy with Untrusted Domains

References