Are there any security concerns with the current PHP code implementation?

The current PHP code implementation is vulnerable to SQL injection attacks due to the use of concatenated SQL queries. To address this security concern, parameterized queries should be used to prevent malicious input from being executed as SQL commands. 

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

$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";

// Fixed code using parameterized queries
$stmt = $pdo->prepare("SELECT * FROM users WHERE username=:username AND password=:password");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

Keywords

SQL injection cross-site scripting input validation secure coding practices password hashing.

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