PenPot MCP REPL server binds to 0.0.0.0 with unauthenticated /execute endpoint — RCE

Summary The MCP module's ReplServer binds to all interfaces 0.0.0.0:4403 and exposes a /execute endpoint that runs arbitrary code with zero authentication. Anyone on the network can POST JavaScript and it runs on the server. The main PenpotMcpServer was partially fixed for a similar binding issue...