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The only safe, legal way is to from OffSec. Once you enroll ($799–$1599 depending on training + exam voucher), you get:

XSS is often underestimated. The WEB-200 PDF shows you how to turn a simple reflected XSS into a full remote code execution (RCE) via:

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You can download the Web 200: Offensive Security PDF from [insert link]. Make sure to check the official website for any updates or revisions to the guide.