Overly Permissive Cross-domain Whitelist Affecting rabbitmq-server package, versions <3.9.27-0ubuntu0.6


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.37% (30th percentile)

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  • Snyk IDSNYK-UBUNTU2204-RABBITMQSERVER-20126160
  • published16 Oct 2026
  • disclosed23 Sept 2026

Introduced: 23 Sep 2026

CVE-2026-66070  (opens in a new tab)
CWE-942  (opens in a new tab)

How to fix?

Upgrade Ubuntu:22.04 rabbitmq-server to version 3.9.27-0ubuntu0.6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rabbitmq-server package and not the rabbitmq-server package as distributed by Ubuntu. See How to fix? for Ubuntu:22.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1