Master secure web development with real-world exploits and defenses. Learn to think like a hacker to build like a fortress.
From basic HTML hardening to advanced Web3 auditing—build unbreakable web applications step by step.
Practice on real vulnerable code. Fix the XSS flaw below and see your security skills in action.
This function directly inserts user input into the DOM without sanitization.
A malicious user could inject <script>
tags!
Using textContent
instead of
innerHTML
prevents script execution!
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"The Web3 security module helped me land a role auditing DeFi protocols. Now I'm finding critical vulnerabilities daily!"
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