What potential security risks are associated with using variable includes in PHP scripts?

Using variable includes in PHP scripts can introduce security risks such as directory traversal attacks, where an attacker can manipulate the variable to include files from outside the intended directory. To mitigate this risk, it is recommended to validate and sanitize user input before using it in includes. 

// Validate and sanitize the user input before using it in includes
$filename = 'path/to/includes/' . basename($_GET['file']);
if (file_exists($filename)) {
    include $filename;
} else {
    echo 'Invalid file';
}

Keywords

PHP security risks variable includes code injection vulnerability

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