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36. What is XSS? How to prevent it?

XSS stands for Cross-Site Scripting, which is a security vulnerability that allows an attacker to inject malicious code into a website. This can occur when user input is not properly sanitized and the attacker is able to insert code into a website that is displayed to other users.

To prevent XSS, there are several best practices to follow:

  1. Sanitize user input by removing or encoding any special characters that could be used to inject malicious code.

  2. Use a Content Security Policy (CSP) header to restrict the types of content that can be loaded by a website. This can prevent malicious scripts from being executed.

  3. Implement input validation to ensure that user input meets specific criteria before it is allowed to be displayed on the website.

  4. Ensure that cookies and other sensitive data are securely transmitted and stored.

By following these practices and staying vigilant, it is possible to prevent XSS attacks and keep your website safe and secure.