What potential pitfalls should be considered when using session variables in PHP for user authentication?

One potential pitfall when using session variables in PHP for user authentication is session fixation attacks, where an attacker sets a user's session ID before the user logs in. To mitigate this risk, you can regenerate the session ID upon successful authentication. 

// Start the session
session_start();

// Regenerate the session ID upon successful authentication
if ($authenticated) {
    session_regenerate_id(true);
}

Keywords

session variables user authentication security risks session hijacking session fixation

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