RabbitMQ: OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint

{
  "id": "ac7e14532ea62b4a038d9217f41f564ea8f64f903c5e45251fd650971690edab",
  "url": "https://osv.dev/vulnerability/CVE-2026-67410",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ: OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint",
    "summary": "RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.3.3 and 4.2.9, OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint (CWE-200). when OAuth2 authentication is enabled for the RabbitMQ Management UI and the configured flow, IDP use a client secret, the oauthclientsecret configuration value is included in the JavaScript served by the unauthenticated endpoint /js/oidc-oauth/bootstrap.js. Any user who can reach the management UI port can retrieve the OAuth2 client secret without Files: deps/rabbitmqmanagement/src/rabbitmgmtwmauth.erl, line 186 deps/rabbitmqmanagement/src/rabbitmgmtoauthbootstrap.erl, lines 35-50 deps/rabbitmqmanagement/src/rabbitmgmtdispatcher.erl, lines 45-49 (route registration) Code Path: 1. The route /js/oidc-oauth/bootstrap.js is registered as a plain Cowboy handler (rabbitmgmtdispatcher.erl:46): Credential exposure for the affected configuration: OAuth2 client secret is accessible without any authentication Token theft: Attacker can complete the authorization code flow using stolen authorization codes Client impersonation: Attacker can make requests. Any RabbitMQ deployment with: This issue is fixed in versions 4.3.3 and 4.2.9.",
    "evidence": "osv:CVE-2026-67410",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-67410",
      "aliases": [
        "BIT-rabbitmq-2026-67410",
        "CVE-2026-67410",
        "GHSA-f9f2-q3jf-wfj3"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/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": "95c501fbad76c66156346cf364d158d6e30aa4d9"
                },
                {
                  "fixed": "47d6d6457c7d1a440daed643cb7d76bba313e79c"
                },
                {
                  "introduced": "1929eeadf9b2bac12c5434fb56884ef27370580e"
                },
                {
                  "fixed": "1d284b2d2a1e2f845ad22b0d5ee38ec372d50802"
                },
                {
                  "fixed": "60a85d3605ebf94fd234497242812547d441d457"
                },
                {
                  "fixed": "869f800998334bb363f2ad046f58de9caedc409e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2.0"
                      },
                      {
                        "fixed": "4.2.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.3.0"
                      },
                      {
                        "fixed": "4.3.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "60a85d3605ebf94fd234497242812547d441d457"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "869f800998334bb363f2ad046f58de9caedc409e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "47d6d6457c7d1a440daed643cb7d76bba313e79c"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.2.9"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1d284b2d2a1e2f845ad22b0d5ee38ec372d50802"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.3.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.2.8",
            "v4.3.2",
            "v4.2.7",
            "v4.3.1",
            "v4.2.6",
            "v4.3.0",
            "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-2026-67410.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.811418161Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9",
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67410.json",
        "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f9f2-q3jf-wfj3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67410",
        "https://github.com/rabbitmq/rabbitmq-server/commit/60a85d3605ebf94fd234497242812547d441d457",
        "https://github.com/rabbitmq/rabbitmq-server/commit/869f800998334bb363f2ad046f58de9caedc409e"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67410.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67410",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489032,
  "published_at": "2026-09-25T16:32:51.225+00:00"
}