Business Logic Bugs That Paid Big: How “Working as Intended” Broke Million-Dollar Systems 🧠💰

After years in bug bounty, here’s something most beginners don’t realize:

👉 The highest payouts rarely come from flashy exploits.
They come from systems doing exactly what they were designed to do.

Business logic bugs don’t scream.
They quietly drain money, bypass controls, and break trust.

And companies pay big to fix them.

🔍 What Are Business Logic Bugs (Really)?

A business logic bug isn’t a coding mistake.

It’s a thinking mistake.

The code works.
The feature works.
The flow works.

But the assumptions are wrong.

Examples:

• “Users wouldn’t do that”
• “This step will always happen first”
• “No one would repeat this action”

Attackers live in those assumptions.

🧠 Why Bug Bounty Hunters Love Logic Bugs

From experience, business logic bugs:

• Bypass WAFs effortlessly
• Evade automated scanners
• Look harmless in isolation
• Create massive real-world impact