GHSA-35w5-pcw4-jx94: PraisonAI: Unauthenticated Event Injection via SSE `/publish` Endpoint

Summary The SSE (Server-Sent Events) server in src/praisonai-agents/praisonaiagents/server/server.py exposes a /publish endpoint that broadcasts arbitrary messages to all connected clients without any authentication. The ServerConfig dataclass (line 24) defines an auth_token field, but this token is never validated in the /publish or /events request handlers. Any attacker with access to the SSE server port can inject arbitrary events into the SSE stream visible to all connected clients, or use /info to leak server configuration including connected client count. Details Vulnerable code (lines 164–180): async def publish(request): try: data = await request.json() event_type = data.get("type", "message") event_data = data.get("data", {}) self.broadcast(event_type, event_data) return JSONResponse({ "success": True, "clients": len(self._clients), }) The auth_token field in ServerConfig (line 31): @dataclass class ServerConfig: ... auth_token: Optional[str] = None This auth_token is never referenced in any request handler. The /publish endpoint processes any POST request regardless of authentication headers. The /info endpoint (line 182) also has no auth and returns server configuration including self.config.to_dict(). Routes registration (lines 190–194): routes = [ Route("/health", health, methods=["GET"]), Route("/events", events, methods=["GET"]), Route("/publish", publish, methods=["POST"]), Route("/info", info, methods=["GET"]), ] No authentication middleware or token validation is applied to any route. PoC Setup: Start the SSE server (default port 8765). This is the documented server mode for streaming agent events. Positive trigger — unauthenticated event injection: From any network-reachable host: curl -X POST http://localhost:8765/publish \ -H "Content-Type: application/json" \ -d '{"type": "message", "data": {"text": "INJECTED: arbitrary content sent to all clients"}}' Expected response: {"success": true, "clients": 3} The response confirms th