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You know that feeling when you’re counting sheep to fall asleep, and you realize you could probably count everyone’s bank accounts too? Yeah, that’s basically what happened to me last week. I found a sequential ID vulnerability that turned into a digital all-you-can-eat data buffet. And for some reason, The Joker decided to be my imaginary consultant throughout the whole thing. 🎭
It all started when I was testing “SecureCorp,” a company that apparently thought “secure” was just a catchy prefix. I had a basic user account and was ready for another boring session of poking around APIs. Little did I know I was about to harvest more data than a combine harvester in a wheat field.
Act 1: The Innocent Discovery — Counting is Fun! 🔢
After my standard recon (I think subfinder and I need couples counseling at this point), I found SecureCorp's main API. I created a…