Labs / Cookie Forge
- Daily Challenge
- Released 16 Sep 2025
🍪 Can you forge the perfect authentication cookie?
This corporate employee portal relies on JWT cookies to manage user sessions and access controls, but the developers made some critical security assumptions. 🔐 What appears to be a secure authentication system might just be waiting for the right manipulation to unlock administrative privileges. 💡 Master the art of JWT token forging and discover how a simple cookie modification can grant you access to the company's most sensitive data! 🕵️
Start Lab Environment
Launch your dedicated AWS machine to begin hacking
🍪 Web Security: JWT Cookie Manipulation
JSON Web Tokens (JWTs) are widely used for authentication and authorization in modern web applications. However, improper implementation can lead to serious security vulnerabilities, including privilege escalation through token manipulation. This challenge explores real-world JWT security flaws that allow attackers to forge authentication cookies.
🎯 What You'll Learn
- ✓ JWT structure and components analysis
- ✓ Cookie-based authentication vulnerabilities
- ✓ JWT signature bypass techniques
- ✓ Privilege escalation through token manipulation
🔍 Challenge Overview
You're presented with a corporate employee portal that uses JWT tokens stored in cookies for authentication. The application has a security flaw that allows you to manipulate your authentication token to gain administrative access and retrieve sensitive information.