How can the visibility of all user names and email addresses in a dropdown menu pose a security risk in PHP applications?

Having the visibility of all user names and email addresses in a dropdown menu can pose a security risk as it exposes sensitive information to unauthorized users. To mitigate this risk, you can implement access control mechanisms to ensure that only authenticated users can view the dropdown menu. 

<?php
// Check if the user is authenticated before displaying the dropdown menu
session_start();

if(isset($_SESSION['user_id'])) {
    // Display dropdown menu with user names and email addresses
    echo "<select>";
    // Populate dropdown menu with user names and email addresses
    echo "</select>";
} else {
    // Redirect to login page if user is not authenticated
    header("Location: login.php");
    exit();
}
?>

Keywords

SQL injection Cross-site scripting (XSS) Data leakage User enumeration Security vulnerability

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