The issue allows remote attackers to inject arbitrary web script or HTML. This can be achieved via several parameters and files, including the `league` parameter to files such as "football classification.php", "football criteria.php", "templates/template default preview.php", or "templates/template worldCup preview.php"; the `f` parameter to "football-functions.php"; the `id` parameter in an "action" action to files like "football groups list.php", "football matches list.php", "football matches phase.php", or "football phases list.php"; or the `id league` parameter in a delete action to "football matches load.php".