Securing REST APIs: Critical Vulnerabilities and Mitigation

Modern web and mobile applications are built on API architectures. With so much data passing between frontends, databases, and microservices, APIs have become the primary attack surface for malicious cyber activity.

Critical API Exploits and Protection Patterns

• BOLA (Broken Object Level Authorization): The backend must check if the current user profile has explicit ownership of the requested resource ID.
• Rate Limiting limits: Implement rate limit limits at the cloud load balancer level to protect backend databases from request loops.
• Transit Encryption: Force TLS 1.3 tunnels on all API configurations, deprecating older HTTP methods.

// Example Express rate limiter setup
const rateLimit = require('express-rate-limit');
const apiLimiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100 // limit each IP to 100 requests per windowMs
});
app.use('/api/', apiLimiter);