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/Web Payload Lab

Explore and transform common web security payloads in a local educational sandbox.

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Educational Purpose Only: These payloads are provided for authorized security testing (CTFs, local labs, and penetration tests) to help defenders understand and mitigate vulnerabilities. Do not use them against systems you do not have permission to test.

Original Payload

<script>alert(1)</script>

Encoded Payload

%3Cscript%3Ealert(1)%3C%2Fscript%3E

Understanding the Payload

Mechanism

The most basic Cross-Site Scripting payload. It attempts to execute JavaScript directly via a script block.

Expected Context

Reflected in the HTML body (e.g., between <div> tags) without sanitization or HTML encoding.

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