In what scenarios could a sudden IP address change during a session indicate a potential security threat or attack?

A sudden IP address change during a session could indicate a potential security threat or attack, such as session hijacking or man-in-the-middle attacks. To mitigate this risk, you can implement a check to verify the user's IP address remains consistent throughout the session. If the IP address changes unexpectedly, you can invalidate the session and require the user to re-authenticate. 

session_start();

if(isset($_SESSION['user_ip']) && $_SESSION['user_ip'] !== $_SERVER['REMOTE_ADDR']){
    session_unset();
    session_destroy();
    // Redirect to login page or display an error message
}

$_SESSION['user_ip'] = $_SERVER['REMOTE_ADDR'];

Keywords

IP address change session hijacking security threat attack detection PHP session management

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