- 891
- 245
How common are XSS vulnerabilities? XSS vulnerabilities are very common, and XSS is probably the most frequently occurring web security vulnerability.
How common are XSS attacks? It is difficult to get reliable data about real-world XSS attacks, but it is probably less frequently exploited than other vulnerabilities.
What is the difference between XSS and CSRF? XSS involves causing a web site to return malicious JavaScript, while CSRF involves inducing a victim user to perform actions they do not intend to do.
What is the difference between XSS and SQL injection? XSS is a client-side vulnerability that targets other application users, while SQL injection is a server-side vulnerability that targets the application's database.
How do I prevent XSS in PHP? Filter your inputs with a whitelist of allowed characters and use type hints or type casting. Escape your outputs with htmlentities and ENT_QUOTES for HTML contexts, or JavaScript Unicode escapes for JavaScript contexts.
How do I prevent XSS in Java? Filter your inputs with a whitelist of allowed characters and use a library such as Google Guava to HTML-encode your output for HTML contexts, or use JavaScript Unicode escapes for JavaScript contexts.
How common are XSS attacks? It is difficult to get reliable data about real-world XSS attacks, but it is probably less frequently exploited than other vulnerabilities.
What is the difference between XSS and CSRF? XSS involves causing a web site to return malicious JavaScript, while CSRF involves inducing a victim user to perform actions they do not intend to do.
What is the difference between XSS and SQL injection? XSS is a client-side vulnerability that targets other application users, while SQL injection is a server-side vulnerability that targets the application's database.
How do I prevent XSS in PHP? Filter your inputs with a whitelist of allowed characters and use type hints or type casting. Escape your outputs with htmlentities and ENT_QUOTES for HTML contexts, or JavaScript Unicode escapes for JavaScript contexts.
How do I prevent XSS in Java? Filter your inputs with a whitelist of allowed characters and use a library such as Google Guava to HTML-encode your output for HTML contexts, or use JavaScript Unicode escapes for JavaScript contexts.