RabbitMQ: Reflected XSS via the OAuth bootstrap JS endpoint

{
  "id": "f979c249330f1f4c83fc82f6bb96db11f20d5751216fd8b767785cf9d1642922",
  "url": "https://osv.dev/vulnerability/BIT-rabbitmq-2026-67237",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ: Reflected XSS via the OAuth bootstrap JS endpoint",
    "summary": "RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, set_token_auth/2 inserted a bearer token from the Authorization header or access_token cookie into OAuth bootstrap JavaScript without escaping, allowing attacker-controlled token content to execute JavaScript in the management UI origin. The endpoint is exposed before authentication only when management.oauth_enabled is true, and exploitation through the cookie path additionally requires the attacker to plant an access_token cookie on the management host. This issue is fixed in versions 4.2.8 and 4.3.2.",
    "evidence": "osv:BIT-rabbitmq-2026-67237",
    "products": [
      {
        "name": {
          "value": "rabbitmq",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.2.8",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.3.2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "BIT-rabbitmq-2026-67237",
      "aliases": [
        "BIT-rabbitmq-2026-67237",
        "CVE-2026-67237",
        "GHSA-2rf7-f6r6-8rwh"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "4.2.0"
                },
                {
                  "fixed": "4.2.8"
                },
                {
                  "introduced": "4.3.0"
                },
                {
                  "fixed": "4.3.2"
                }
              ]
            }
          ],
          "package": {
            "name": "rabbitmq",
            "purl": "pkg:bitnami/rabbitmq",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/rabbitmq/BIT-rabbitmq-2026-67237.json"
          }
        }
      ],
      "modified": "2026-10-21T12:00:37.715312656Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/rabbitmq-server/commit/5cd6d841d84450324a4613501ed917d98828af23",
        "https://github.com/rabbitmq/rabbitmq-server/commit/a8041d528c1a71af4cb75ade247ed082fe6b83fb",
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8",
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2",
        "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-2rf7-f6r6-8rwh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67237"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:vmware:rabbitmq:*:*:*:*:*:*:*:*"
        ],
        "severity": "Critical"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67237",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 393016,
  "published_at": "2026-10-01T09:33:33.098+00:00"
}