What are the potential security risks of allowing cross-domain file access in PHP scripts?

Allowing cross-domain file access in PHP scripts can pose security risks such as exposing sensitive information, allowing unauthorized access to files, and potential injection attacks. To mitigate these risks, it is important to validate and sanitize user input, restrict file access permissions, and implement proper authentication and authorization mechanisms. 

// Example of restricting file access to a specific directory
$allowed_directory = '/path/to/allowed/directory/';

if (strpos(realpath($file_path), $allowed_directory) !== 0) {
    die("Access denied");
}

// Code to handle file access within the allowed directory

Keywords

Cross-domain file access security risks PHP scripts vulnerabilities data leakage

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