API Security Testing Basics with Postman and Burp Suite

1 min read web-security
#api-security #burp-suite #postman #owasp

Why API Security Matters

APIs are the backbone of modern applications. As a Postman API Fundamentals Student Expert, I’ve learned that understanding API security is critical for any security professional.

Common API Vulnerabilities

  1. Broken Object Level Authorization (BOLA) — Accessing other users’ data by manipulating IDs
  2. Broken Authentication — Weak or missing authentication mechanisms
  3. Excessive Data Exposure — APIs returning more data than necessary
  4. Lack of Rate Limiting — Brute force and enumeration attacks
  5. Injection — SQL, NoSQL, and command injection via API parameters

Testing with Postman

{
  "method": "GET",
  "url": "{{baseUrl}}/api/users/{{userId}}",
  "headers": {
    "Authorization": "Bearer {{token}}"
  }
}

Testing with Burp Suite

Use Burp’s proxy to intercept API requests, then leverage Repeater and Intruder for systematic testing.

Authorization Testing

Always test horizontal and vertical privilege escalation by changing user IDs and role parameters in API requests.

Conclusion

Combine Postman for structured API testing with Burp Suite for deep security analysis. Document every finding methodically.

zer0arc4

zer0arc4

Cybersecurity Student | Penetration Tester | Aspiring Red Teamer

Documenting my journey through cybersecurity, penetration testing, CTFs, research, and tool development.

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