APIFold Vulnerable to Unauthenticated Webhook Event Injection

{
  "id": "68e03fe19b5d691d4e1e30a4246f474a3e01cf080ae8b5a313f268eb7d7897b5",
  "url": "https://osv.dev/vulnerability/CVE-2026-47769",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "APIFold Vulnerable to Unauthenticated Webhook Event Injection",
    "summary": "APIFold reads an OpenAPI 3.x or Swagger 2.x specification and generates a live, production-ready MCP server endpoint. Prior to commit 7f19b52280f414f57af2b79a95333d1c8fbeece5, the `/webhooks/:serverSlug/:eventName` endpoint accepts arbitrary unauthenticated JSON and stores it in Redis and the `webhook_events` PostgreSQL table without any signature check or authentication requirement. The root cause is that `createWebhookRouter` is called at `server.ts:188` without a `validators` map, so `receivers.ts:80`'s optional-chaining guard evaluates to `undefined` and the signature-validation block (`receiver.ts:81–95`) is unconditionally skipped. Any unauthenticated network client that knows a valid server slug can inject arbitrary payloads, which are subsequently served as trusted resource state to legitimate MCP clients. Commit 7f19b52280f414f57af2b79a95333d1c8fbeece5 patches the issue.",
    "evidence": "osv:CVE-2026-47769",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-47769",
      "aliases": [
        "CVE-2026-47769",
        "GHSA-x82h-9r8v-m672"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/work90210/apifold",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7f19b52280f414f57af2b79a95333d1c8fbeece5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7f19b52280f414f57af2b79a95333d1c8fbeece5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7f19b52280f414f57af2b79a95333d1c8fbeece5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7f19b52280f414f57af2b79a95333d1c8fbeece5"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47769.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.845868861Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47769.json",
        "https://github.com/Work90210/APIFold/security/advisories/GHSA-x82h-9r8v-m672",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-47769",
        "https://github.com/Work90210/APIFold/commit/7f19b52280f414f57af2b79a95333d1c8fbeece5",
        "https://github.com/Work90210/APIFold/pull/235"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47769.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-47769",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500136,
  "published_at": "2026-07-23T17:23:27.57+00:00"
}