Cross-site scripting (XSS) vulnerability in liens.php3 in liens_dynamiques 2.1 allows remote attackers to inject arbitrary web script or HTML by using the ajouter=1 query string and the add menu.

(1) admin/adminlien.php3 and (2) admin/modif.php3 in liens_dynamiques 2.1 do not require authentication, which allows remote attackers to perform unauthorized administrative actions using a direct request.