RabbitMQ: Unsanitized vhost names allow for XSS in management UI

{
  "id": "4b108b5b14ee90a45aec153f216e6b86ef09348fd3e255cefd2120e801e5ff6f",
  "url": "https://osv.dev/vulnerability/CVE-2026-44839",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ: Unsanitized vhost names allow for XSS in management UI",
    "summary": "RabbitMQ is a messaging and streaming broker. From 3.7.0 to before 4.1.2 and 4.0.13, This vulnerability is fixed in 4.1.2 and 4.0.13.",
    "evidence": "osv:CVE-2026-44839",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-44839",
      "aliases": [
        "BIT-rabbitmq-2026-44839",
        "CVE-2026-44839",
        "GHSA-fh5r-jpm3-fjwp"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rabbitmq/rabbitmq-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1861a703c1234de44cfd704a9829d68f4b24e65c"
                },
                {
                  "fixed": "c529a212390327e6d62620f25e9e1961ccc3c661"
                },
                {
                  "fixed": "7f54319279d1ece161ae0b4cdc6f0e58a4045eb5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.1.0"
                      },
                      {
                        "fixed": "4.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7f54319279d1ece161ae0b4cdc6f0e58a4045eb5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.1.1",
            "v4.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44839.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.169821749Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44839.json",
        "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-fh5r-jpm3-fjwp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44839",
        "https://github.com/rabbitmq/rabbitmq-server/commit/7f54319279d1ece161ae0b4cdc6f0e58a4045eb5"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-80"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.7.0"
                  },
                  {
                    "fixed": "4.0.13"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44839.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44839",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500477,
  "published_at": "2026-05-27T15:07:10.366+00:00"
}