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.