Unveiling a Bug: Paying $1 and Receiving $100 (or Any Amount) in Return

Hi everyone, this write-up is about a vulnerability I discovered in a private bug bounty program. Due to privacy & legal concerns, I will be providing sample requests and screenshots to illustrate the vulnerability.

If you are interested in my previous write-ups, you can find them below:

IDOR Vulnerability that exposed 17 Million user data (IDOR Diaries)

Introduction

In this write-up, I will discuss a critical bug that I discovered within a payment system, …

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