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Labs / JWT Bypass

  • Daily Challenge
  • Released 25 Jul 2025
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Daily Challenge

JWT Bypass - Challenge Description

Challenge Overview

Welcome to JWT Bypass! In this challenge, you'll dive into the world of JSON Web Token (JWT) security. You're tasked with analyzing a web application that uses JWT for authentication and finding a way to bypass the security controls to gain administrative access.

Learning Objectives

  • Understanding JWT structure and components
  • Identifying common JWT vulnerabilities
  • Using tools for JWT analysis and exploitation
  • Learning about secure JWT implementation practices

Challenge Details

The challenge presents you with a web application that uses JWT tokens for user authentication. Your mission is to analyze the JWT implementation, identify security weaknesses in the token handling, exploit the vulnerability to forge admin tokens, and access the admin panel to retrieve the flag.

Technical Background

JSON Web Tokens (JWTs) are a popular method for securely transmitting information between parties. However, improper implementation can lead to serious security vulnerabilities such as weak secrets, algorithm confusion, and token manipulation attacks.

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