What are the potential security risks associated with handling user authentication in PHP?

One potential security risk associated with handling user authentication in PHP is the vulnerability to SQL injection attacks. To mitigate this risk, it is important to use prepared statements or parameterized queries when interacting with the database to prevent malicious users from injecting SQL code into the authentication process. 

// Using prepared statements to prevent SQL injection

// Assuming $username and $password are user input
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username AND password = :password');
$stmt->execute(['username' => $username, 'password' => $password]);
$user = $stmt->fetch();

if ($user) {
    // User authenticated successfully
} else {
    // Authentication failed
}

Keywords

SQL injection Cross-site scripting Session hijacking Password hashing Two-factor authentication

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