What potential issue is highlighted in the code snippet provided in the forum thread?

The potential issue highlighted in the code snippet is that the database query is vulnerable to SQL injection attacks because the user input is directly concatenated into the SQL query string. To solve this issue, you should use parameterized queries or prepared statements with placeholders for user input to prevent SQL injection attacks. 

// Original code snippet with SQL injection vulnerability
$userInput = $_POST['user_input'];
$query = "SELECT * FROM users WHERE username = '$userInput'";
$result = mysqli_query($connection, $query);

// Fixed code snippet using parameterized queries
$userInput = $_POST['user_input'];
$query = "SELECT * FROM users WHERE username = ?";
$stmt = $connection->prepare($query);
$stmt->bind_param("s", $userInput);
$stmt->execute();
$result = $stmt->get_result();

Keywords

SQL injection vulnerability prepared statements escaping security.

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