How to Prevent Cross-Site Scripting (XSS) Attacks in Web Applications

Cross-site scripting (XSS) attacks are a type of security vulnerability that allows attackers to inject malicious code into a web application. This can allow them to steal sensitive information, hijack user sessions, or even take control of the entire website.

There are several ways to prevent XSS attacks, including:

  • Input validation: Validate all user input for potentially malicious characters. This can be done using regular expressions or other validation techniques.
  • Output encoding: Encode all user input before it is displayed on the page. This will prevent any malicious code from being executed.
  • Content security policy (CSP): Implement a CSP to restrict the types of content that can be loaded on the page. This can help to prevent attackers from loading malicious scripts.
  • Cross-origin resource sharing (CORS): Configure CORS headers to restrict the domains that can access the website's resources. This can help to prevent attackers from launching XSS attacks from other websites.
  • HTTP headers: Set appropriate HTTP headers to prevent the browser from caching malicious content.

Related Questions:

  • What is cross-site scripting?
  • How can XSS attacks be prevented?
  • What is input validation?
  • What is output encoding?
  • What is content security policy?

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