XSS is a web vulnerability where attackers inject malicious scripts into web pages viewed by other users.
Exploits user input that is not properly validated or escaped
Can steal cookies, session tokens, or deface websites
Common in comment sections, forms, or search fields
Stored XSS – Malicious script stored on the server
Reflected XSS – Script reflected via URL or input
DOM-based XSS – Script executed in client-side code
Escape or sanitize user input
Use Content Security Policy (CSP)
Validate and encode output
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