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03. High-Value Vulnerability Analysis

Focusing on business logic flaws and authorization vulnerabilities yields the highest impact reports.

1. Race Condition Vulnerabilities

Race conditions occur when an API processes concurrent requests without atomic transaction locks, allowing actions (such as redeeming a promo code or transferring funds) to execute multiple times simultaneously.

Request 1 (Redeem Code) ──┐
                          ├──► API checks: Is Code Used? (No) ──► Applies $50 Credit (Req 1)
Request 2 (Redeem Code) ──┘   API checks: Is Code Used? (No) ──► Applies $50 Credit (Req 2)

2. BOLA & Authorization Bypass Testing

Automating authorization checks using Burp extensions like Autorize compares HTTP responses between high-privileged and low-privileged user tokens automatically.

Next Chapter: 04. Report Writing & Triage Communication →

1. Race Condition Vulnerabilities
2. BOLA & Authorization Bypass Testing