What are the potential pitfalls of displaying session variable data in readonly form fields in PHP forms?

Displaying session variable data in readonly form fields can expose sensitive information to users. To prevent this, you should validate and sanitize the session variable data before displaying it in readonly form fields. This ensures that only safe and appropriate information is shown to users. 

<?php
session_start();

// Validate and sanitize session variable data before displaying in readonly form fields
$readonly_data = isset($_SESSION['readonly_data']) ? htmlspecialchars($_SESSION['readonly_data']) : '';

?>

<!DOCTYPE html>
<html>
<head>
    <title>Display Session Variable Data</title>
</head>
<body>
    <form>
        <label for="readonly_field">Readonly Field:</label>
        <input type="text" id="readonly_field" name="readonly_field" value="<?php echo $readonly_data; ?>" readonly>
    </form>
</body>
</html>

Keywords

session variables readonly form fields security vulnerabilities cross-site scripting data leakage

Related Questions