Labs / API Logic Flaw
- Daily Challenge
- Released 21 Jul 2025
API Logic Flaw
Start the machine, hack the system, and find the hidden flags to complete this challenge and earn points!
1
Flags
1
Points
Daily Challenge
Solution Available
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Start Lab Environment
~1-2 min setup
AWS dedicated
Private instance
Industry standard
Daily Challenge
API Logic Flaw Challenge
Challenge Overview
A PHP API is running with a critical logic flaw in its authentication system. The API has a vulnerability that allows users to bypass authentication by manipulating request parameters. Your task is to identify this logic flaw and exploit it to access the admin panel and extract the hidden flag.
Learning Objectives
- Understand API authentication mechanisms
- Learn about logic flaws in web applications
- Practice parameter manipulation techniques
- Recognize authentication bypass vulnerabilities
- Develop API testing and exploitation skills
Challenge Details
The API provides several endpoints including authentication, user profile access, and an admin panel. Analyze the API behavior and find the logic flaw that allows you to bypass authentication and access protected resources. The flag is hidden in the admin panel.