What are the potential pitfalls of using pre-built login scripts found through online searches?

One potential pitfall of using pre-built login scripts found through online searches is the lack of security measures implemented in the code. To solve this issue, it is important to thoroughly review and modify the code to include proper security measures such as input validation, password hashing, and protection against SQL injection attacks. 

// Example of a secure login script with input validation and password hashing

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];

    // Validate input
    if (empty($username) || empty($password)) {
        echo "Username and password are required";
    } else {
        // Hash the password
        $hashed_password = password_hash($password, PASSWORD_DEFAULT);

        // Perform database query to check if username and hashed password match
        // Add your database connection and query here
    }
}

Keywords

security vulnerabilities SQL injection cross-site scripting password hashing authentication cookies

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