Multiple cross-site scripting (XSS) vulnerabilities in Claroline before 1.11.9 allow remote attackers to inject arbitrary web script or HTML via the (1) box parameter to messaging/messagebox.php, cidToEdit parameter to (2) adminregisteruser.php or (3) admin_user_course_settings.php in admin/, (4) module_id parameter to admin/module/module.php, or (5) offset parameter to admin/right/profile_list.php.

Claroline 1.9.7 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by work/connector/linker.cnr.php and certain other files.