Project Detected: Node.js Express API with JWT authentication --- Security Risks Found: - CORS allows requests from every origin - Production error responses expose internal error details - JWT secret configuration is not validated at startup - Security headers are not configured --- Security Fixes Applied: - Restricted CORS origins through environment-based configuration - Added production-safe error responses - Added startup validation for JWT_SECRET - Added secure HTTP headers using existing Express middleware patterns --- Files Modified: - src/app.js - src/middleware/errorHandler.js - src/config/env.js - .env.example - package.json --- Commands Executed: - npm audit - npm test - npm run lint --- Validation Result: Tests and linting passed successfully. The dependency audit reported one moderate development-only issue that was not automatically upgraded. --- Remaining Risks: - Rate limiting is not yet configured on the login endpoint - Production proxy and HTTPS settings should be verified on the hosting platform --- Recommended Next Step: Add rate limiting to authentication routes before public deployment.