How can URL parameters be manipulated and exploited by malicious users, and what measures can be taken to prevent this?

URL parameters can be manipulated by malicious users by altering the values in the URL to perform actions they are not authorized to do, such as accessing sensitive information or executing harmful scripts. To prevent this, input validation and sanitization should be implemented to ensure that only expected values are accepted and processed by the application. 

// Example of input validation and sanitization to prevent URL parameter manipulation
$userId = filter_input(INPUT_GET, 'user_id', FILTER_VALIDATE_INT);

if ($userId === false) {
    // Handle invalid input
    die('Invalid user ID');
}

// Proceed with processing the user ID

Keywords

URL parameters manipulation exploitation security measures PHP functions

Related Questions