Validating user input before execution and interpretation can help to prevent dynamic code evaluation script injection vulnerabilities by checking and filtering any malicious input from the user that may contain code or commands. Dynamic code evaluation script injection is a type of vulnerability that occurs when an application accepts user input and executes or interprets it as part of its own code without proper validation or sanitization. This can allow an attacker to inject arbitrary code or commands into the application and execute them with the same privileges as the application . Validating user input before execution and interpretation can help to ensure that the input conforms to the expected format, length and type, and does not contain any malicious characters or syntax that may alter the logic or behavior of the application .