What are the potential security risks associated with storing user data in sessions in PHP?

Storing user data in sessions in PHP can pose security risks if the session data is not properly sanitized or validated. This can lead to session hijacking, session fixation, and other vulnerabilities that can compromise user data. To mitigate these risks, it is important to validate and sanitize user input before storing it in sessions. 

// Validate and sanitize user input before storing it in sessions
$_SESSION['user_data'] = filter_var_array($_POST, [
    'username' => FILTER_SANITIZE_STRING,
    'email' => FILTER_SANITIZE_EMAIL,
    // Add more fields as needed
]);

Keywords

session hijacking session fixation session data exposure cross-site scripting insecure session handling

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