application-security

XSS

Cross-Site Scripting

Definition

XSS is a web security vulnerability that allows attackers to inject malicious scripts into pages viewed by other users. It occurs when applications include untrusted data in web output without proper validation or encoding.

XSS can steal session tokens, redirect users, or deface websites, making it one of the OWASP Top 10 vulnerabilities.

Related Terms

CSRF

Cross-Site Request Forgery

WAF

Web Application Firewall

DAST

Dynamic Application Security Testing

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