What are common security risks associated with the PHP code provided in the forum thread?

The PHP code provided in the forum thread is vulnerable to SQL injection attacks due to the direct concatenation of user input into SQL queries. To mitigate this risk, you should use prepared statements with parameterized queries to prevent malicious SQL injection attempts. 

// Original vulnerable code
$username = $_POST['username'];
$password = $_POST['password'];

$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = mysqli_query($connection, $query);

// Fixed code using prepared statements
$stmt = $connection->prepare("SELECT * FROM users WHERE username=? AND password=?");
$stmt->bind_param("ss", $username, $password);
$stmt->execute();
$result = $stmt->get_result();

Keywords

SQL injection cross-site scripting insecure file uploads session hijacking code injection

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