What are the potential security risks associated with CSV injection in PHP?

CSV injection in PHP occurs when user input is not properly sanitized before being inserted into a CSV file, allowing an attacker to inject malicious code that can be executed when the CSV file is opened in a program like Excel. To prevent CSV injection, user input should be properly sanitized by escaping special characters and using functions like `fputcsv()` to write data to the CSV file. 

// Sanitize user input before writing to CSV file
$user_input = $_POST['user_input'];
$escaped_input = str_replace(array("\n", "\r", "\t"), '', $user_input); // Remove newline, carriage return, and tab characters

$fp = fopen('data.csv', 'a');
fputcsv($fp, array($escaped_input));
fclose($fp);

Keywords

CSV injection PHP security risks data validation user input

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