Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
All challenges
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XSS Basics - Guestbook
Mission
This web application has a basic XSS vulnerability. Find where input is reflected in the guestbook and retrieve the flag.
Hints
Hint 1 Show
Focus on the message parameter
Hint 2 Show
Test if HTML tags or event handlers execute
Hint 3 Show
Start with <script>alert(1)</script>
Hint 4 Show
After confirmation, retrieve the flag