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How can I prevent session fixation attacks on my web application?

Asked on Oct 11, 2025

Answer

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To prevent session fixation attacks, regenerate the session ID after a user logs in to ensure that the session ID is not predictable or reused.

<!-- BEGIN COPY / PASTE -->
    // Example in PHP
    session_start();
    // Regenerate session ID to prevent fixation
    session_regenerate_id(true);
    // Continue with user authentication
    $_SESSION['user_id'] = $userId;
    <!-- END COPY / PASTE -->

Additional Comment:

Always regenerate the session ID after a successful login to prevent attackers from using a fixed session ID.
Ensure that session cookies have the 'HttpOnly' and 'Secure' flags set to protect against XSS and eavesdropping.
Implement a short session timeout to limit the duration of any potential session hijacking.

✅ Answered with Security best practices.

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