Lab Description

In this lab, you are placed in the role of a security analyst reviewing the OWASP Juice Shop application, a platform designed for security training. During your investigation, you find that the application uses version 0.1.3 of the express-jwt package, which contains well-documented security vulnerabilities. A review of its GitHub repository reveals a “SECURITY BUG” section that outlines flaws such as improper token validation, acceptance of unsigned tokens, and algorithm manipulation issues. These weaknesses can be exploited to bypass authentication controls, gain unauthorized access, and potentially hijack user accounts.

Your task is to analyze the implementation of express-jwt, identify how these vulnerabilities affect the Juice Shop's security posture, and perform practical attacks to demonstrate their impact. You will also recommend and implement mitigation strategies such as updating the dependency, validating algorithms securely, and applying strict JWT validation rules.

Through this exercise, you’ll gain valuable hands-on experience with real-world authentication flaws and learn how to secure modern web applications against JWT-related risks.

What You Will Learn

Program Curriculum

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