What are the potential security risks associated with using user input in PHP to update a list on a website?

One potential security risk associated with using user input in PHP to update a list on a website is the possibility of SQL injection attacks. To mitigate this risk, it is important to sanitize and validate user input before using it in database queries. 

// Sanitize and validate user input before updating the list
$input = $_POST['user_input'];
$sanitized_input = filter_var($input, FILTER_SANITIZE_STRING);

// Prepare and execute the database query with the sanitized input
$stmt = $pdo->prepare("UPDATE list SET item = :item WHERE id = :id");
$stmt->bindParam(':item', $sanitized_input);
$stmt->bindParam(':id', $id);
$stmt->execute();

Keywords

SQL injection cross-site scripting input validation data sanitization prepared statements

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