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Business Logic Vulnerabilities: 15 Test Cases Every Bug Bounty Hunter Needs to Know
I was testing an e-commerce application last year. Nikto found nothing. Burp’s active scan came back clean. On paper, the app looked locked down.
Then I tried something simple. I added an item to my cart, applied a discount coupon, removed the item, and added a cheaper one. The coupon stayed applied. I checked out with a five-thousand-rupee item for two hundred.
No SQL injection. No XSS. No CVE number. Just broken logic.
That is what business logic vulnerabilities are. They are not about malformed input or memory corruption. They are about the application doing exactly what it is told, but being told the wrong thing in the wrong order.
Scanners cannot find them because there is nothing technically wrong with the request. The application just failed to think about what a creative user might do.
In this post, I am going to walk you through 15 real-world business logic test cases, what they are, why they work, and exactly how to test them.
What Is Business Logic, Anyway?
Every application has rules. Rules like you can only use a coupon once, you must be logged in to place an order, you cannot buy a negative quantity of items, and you can only access your…
