8. Business Logic Flaws

8. Business Logic Flaws: Business Logic Flaws are like ordering -5 apples from a grocery store so that the cashier registers negative price and ends up giving you money, exploiti

Business Logic Flaws are like ordering -5 apples from a grocery store so that the cashier registers negative price and ends up giving you money, exploiting logical gaps in code flow.

2 Analogies: Business Logic Flaws

Negative Quantity Shopping

2 Reasonings: Why Automated Scanners Miss Logic Flaws

Valid Syntax, Wrong Rules

Automated Tool Blindness

2 LEGO Analogies: Business Rule Limits

Which of the following represents a classic Business Logic Flaw?

Altering request price parameters to purchase a $1000 laptop for $1

Applying a single-use coupon repeatedly in parallel threads to stack discounts

Entering a negative money transfer value to pull cash instead of sending it

Manipulating prices, abusing coupons, and negative inputs exploit gaps in application logic rather than code vulnerabilities.

What should QA engineers focus on to detect business logic flaws in automated tests?

Simulating boundary value tests and negative inputs (negative quantities, empty parameters)