A web security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users.
XSS attacks occur when user input is rendered in HTML without proper sanitization. Stored XSS persists in the database, reflected XSS comes from URL parameters, and DOM-based XSS manipulates client-side JavaScript. Prevention includes input validation, output encoding, and Content Security Policy headers.
Sanitizing user-submitted blog comments to prevent stored XSS that could steal session cookies from other visitors.
XSS is consistently in the OWASP Top 10 — it can lead to session hijacking, data theft, and defacement. Every web application must defend against it.
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