Business Logic Flaw That No One Knows About !

For Non-Members : FREE LINK

जय श्री राम 🚩 Hackers,
In this writeup, I’m sharing one of the most overlooked and dangerous logic flaws I’ve encountered on a real-world car marketplace.

What I Found 🕵️

While testing a car marketplace platform, I discovered a business logic flaw that allowed me to manipulate subscriber counts endlessly — all without any hacking tools or advanced exploits.

On platforms where credibility = trust = sales, inflating followers could lead to financial scams, phishing attacks, and massive trust violations.

Theory Part : Business Logic Flaw

A business logic flaw happens when an application works as intended — but the intent itself is flawed.

In this case, the app allowed users to subscribe (follow) others — but when the subscribing user deleted their account the server never removed that subscriber(follower)

Steps to Replicate

1. Create two accounts On Two Different Browsers
   i) Account A (Main Profile) : Brave Browser
   ii) Account B ( Exploiting Profile ) Chrome Browser
2. Log in as Account B and subscribe to Account A.