Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

While testing a single-page application that relies on JSON Web Tokens (JWT) for authentication, you decode a token issued after successful login and notice the header reads {"alg":"HS256"}. When you intentionally modify it to {"alg":"none"} and strip the signature, the server still accepts the token. Which attack are you exploiting to bypass authentication?

  • Session fixation using a preset session ID

  • JWT algorithm confusion ("none" algorithm) attack

  • Cross-site request forgery (CSRF)

  • SQL injection against the login form

Certified Ethical Hacker (CEH)
Web Application Hacking
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