HACKR.GG
Authentication & Access Control

Business Logic Flaws

The application works exactly as coded — but the code doesn't match how the business should work. Negative prices, skipping steps, discount stacking.

Intermediate40 min7 lessons2 hands-on
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First lesson free. The full module is part of Pro.

You'll be able to

  • ✓Understand what makes a vulnerability a business logic flaw
  • ✓Identify price manipulation, limit bypass, and workflow skip vulnerabilities
  • ✓Test negative values, race conditions, and parameter tampering
  • ✓Think like an attacker to find logic bugs automated scanners miss

Lessons

  1. 1The Airline That Let People Fly for Free
  2. 2What are Business Logic Flaws?
  3. 3The Testing Checklist — Values That Break Logic
  4. 4Tool — curl for API Testing
  5. 5Module quiz
  6. 6Your Turn: Break the RulesHANDS-ON
  7. 7Hands-on Lab: Exploit GadgetlyHANDS-ON
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