RabbitMQ: Cross-vhost quorum-queue status and stream tracking disclosure

{
  "id": "fcb0c71d537169aad563ac16f02eadc1b102df8359566376e238b2d2a0635a07",
  "url": "https://osv.dev/vulnerability/CVE-2026-66076",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ: Cross-vhost quorum-queue status and stream tracking disclosure",
    "summary": "RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, is_authorized/2 calls rabbit_mgmt_util:is_authorized/2, which checks only the management tag, instead of is_authorized_vhost/2. The /api/queues/quorum/:vhost/:queue/status handler reads the vhost from the path without checking that the user can access it. Any management-tagged user can therefore read Raft status, including leader, members, term, and commit index, for quorum queues in inaccessible vhosts, exposing cross-tenant queue names and cluster topology. The management plugin must be enabled and the attacker must have a management tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.",
    "evidence": "osv:CVE-2026-66076",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-66076",
      "aliases": [
        "BIT-rabbitmq-2026-66076",
        "CVE-2026-66076",
        "GHSA-j45q-v7g2-82ph"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rabbitmq/rabbitmq-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "95c501fbad76c66156346cf364d158d6e30aa4d9"
                },
                {
                  "fixed": "8a56c37f099a7bf609a555de3f0ff8ed23964d20"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.2.0"
                      },
                      {
                        "fixed": "4.2.6"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8a56c37f099a7bf609a555de3f0ff8ed23964d20"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.2.6"
                  },
                  {
                    "cpe": "cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2.0"
                      },
                      {
                        "fixed": "4.2.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.2.5",
            "v4.2.4",
            "v4.2.3",
            "v4.2.2",
            "v4.2.1",
            "v4.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66076.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.217563627Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66076.json",
        "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-j45q-v7g2-82ph",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-66076"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.13.0"
                  },
                  {
                    "fixed": "3.13.15"
                  },
                  {
                    "introduced": "4.0.0"
                  },
                  {
                    "fixed": "4.0.20"
                  },
                  {
                    "introduced": "4.1.0"
                  },
                  {
                    "fixed": "4.1.11"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66076.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-66076",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518949,
  "published_at": "2026-09-23T19:57:11.906+00:00"
}