Security and Logic Errors

Learning Objectives

• Identify logic-level security bugs.
• Prevent unauthorized data access patterns.
• Design safer authorization checks.

Typical Logic Vulnerabilities

• Missing ownership checks.
• Trusting user role from client-side input.
• Inconsistent authorization across endpoints.

Prevention Checklist

• Validate identity on server for every sensitive action.
• Enforce role + ownership checks centrally.
• Add negative tests for unauthorized cases.

Summary

Security is not only cryptography; logic correctness is critical.