How I Bought a $400 Jacket for Free Using a Business Logic Flaw Business logic flaws are some of the most dangerous yet overlooked vulnerabilities in modern web applications. They don’t rely on …

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A bug bounty write-up demonstrating a business logic flaw in an e-commerce platform where stacking two promotional coupons (a new customer discount and a newsletter signup coupon) resulted in a $0 cart total for a ~$1400 jacket. The application failed to validate cumulative discount amounts or restrict coupon combinations, allowing a complete price bypass with no payment required. The post highlights why business logic bugs are valuable targets for beginners: they require no special tools, have high impact, and are difficult to detect with automated scanners.

How I Bought a $400 Jacket for Free Using a Business Logic Flaw

💥 Exploitation: Coupon Stacking Logic Flaw