Guardian language-system passes the id GET parameter directly into a PHP exec() call in text.php ...

Guardian language-system passes the id GET parameter directly into a PHP exec() call in text.php (line 15) without sanitization: exec("php jobs/text.php ".$login_session." ".$_GET['id']." ..."). No authentication is required. An unauthenticated remote attacker can append shell metacharacters to execute arbitrary OS commands on the server.