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Hackers will attack your web application using Cross Site Scripting, SQL Injection, Path Traversal, and other attacks to take over your website. These mistakes are common mistakes and their prevention methods. Use proper encoding on user input to escape any dangerous code. Never directly use user input for generating response contents. Generating and using file paths that contain user inputs is one of the most dangerous mistakes that can cause critical vulnerabilities like: Local File Inclusion, Remote File Disclosure and Path Traveral.