input-sanitization

To prevent XSS in web applications, you need a comprehensive input-sanitization framework that applies explicit validation rules, optional HTML sanitizers, and security headers middleware to enforce defense in depth across all input boundaries.

The best way to sanitize file uploads is to validate content, size, and extensions before processing or storage. Applying defense in depth ensures untrusted files are rejected early, preventing unsafe data from reaching downstream rendering surfaces.

To enforce Content Security Policy (CSP) headers, you apply security headers middleware within your application pipeline. This establishes trusted contexts for rendering dynamic content, mitigating cross-site scripting risks by restricting browser-level attack surfaces.

Yes, this input sanitization framework explicitly applies to web applications rendering dynamic content across Razor, Blazor, and API surfaces, requiring explicit validation rules at input boundaries to safely process untrusted user data.

You need to register an HTML sanitizer in your DI container when your application accepts user data and renders dynamic content. This allows you to apply validation at input boundaries and clean user input for safe downstream processing.