Network-AI is a TypeScript/Node.js multi-agent orchestrator. Prior to version 5.4.5, the MCP SSE server defaults to an empty secret ("process.env['NETWORK_AI_MCP_SECRET'] ?? ''" at "bin/mcp-server.ts:89"), which causes "_isAuthorized" ("lib/mcp-transport-sse.ts:254") to return "true" unconditionally for every request — no "Authorization" header is required. Simultaneously, "_handleRequest" sets "Access-Control-Allow-Origin: *" ("lib/mcp-transport-sse.ts:272") on every response, so a cross-origin browser fetch can read the result without restriction. An unauthenticated attacker who can lure a user to a malicious web page can invoke all 22 exposed MCP tools — including "config_set", "agent_spawn", and "blackboard_write" — against a default-configured localhost server. Version 5.4.5 patches the issue.