{
  "cveId": "CVE-2026-66070",
  "url": "https://patchblox.com/security/cve/CVE-2026-66070",
  "summary": "CVE-2026-66070 is fixed in rabbitmq-server on 1 platform, first by rabbitmq-server 4.0.5-10ubuntu5.2, released September 25, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "RabbitMQ: CORS * reflects Origin with Allow-Credentials",
  "description": "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 \u0022\u0022 was configured, so the response echoed the attacker\u0027s 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 = \u0022\u0022), 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\u0027s 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 = \u0022*\u0022, 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.",
  "published": "2026-09-23T13:17:00Z",
  "severity": "Important",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "cwe": "Permissive Cross-domain Security Policy with Untrusted Domains",
  "epss": 0.00372,
  "epssPercentile": 0.31307,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66070",
  "fixes": [
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Debian 14",
      "fixedVersion": "4.3.0-2",
      "fix": "DEBIAN-CVE-2026-66070",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-66070",
      "released": "2026-09-25T19:41:43Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "3.6.10-1ubuntu0.5\u002Besm1",
      "fix": "rabbitmq-server 3.6.10-1ubuntu0.5\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-rabbitmq-server-3.6.10-1ubuntu0.5-esm1",
      "released": "2026-10-19T16:27:57Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.8.3-0ubuntu0.3\u002Besm2",
      "fix": "rabbitmq-server 3.8.3-0ubuntu0.3\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-rabbitmq-server-3.8.3-0ubuntu0.3-esm2",
      "released": "2026-10-19T16:28:02Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.9.27-0ubuntu0.6",
      "fix": "rabbitmq-server 3.9.27-0ubuntu0.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-rabbitmq-server-3.9.27-0ubuntu0.6",
      "released": "2026-10-19T16:28:05Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.12.1-1ubuntu1.7",
      "fix": "rabbitmq-server 3.12.1-1ubuntu1.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-rabbitmq-server-3.12.1-1ubuntu1.7",
      "released": "2026-10-19T16:28:08Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.0.5-10ubuntu5.2",
      "fix": "rabbitmq-server 4.0.5-10ubuntu5.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-rabbitmq-server-4.0.5-10ubuntu5.2",
      "released": "2026-09-25T10:17:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}