What are the potential security risks associated with allowing users to input PHP code that is stored and executed from a database?

Allowing users to input PHP code that is stored and executed from a database can lead to serious security risks such as SQL injection, cross-site scripting (XSS), and remote code execution. To mitigate these risks, it is important to properly validate and sanitize user input before executing it as PHP code. 

// Sanitize user input before executing it as PHP code
$user_input = $_POST['user_input']; // Assuming the user input is coming from a form submission

// Validate and sanitize the user input
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Execute the sanitized input as PHP code
eval($sanitized_input);

Keywords

SQL injection cross-site scripting (XSS) remote code execution eval function user input validation

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