Multiple cross-site scripting (XSS) vulnerabilities in XOOPS before 2.5.5 allow remote attackers to inject arbitrary web script or HTML via the (1) to_userid parameter to modules/pm/pmlite.php or the (2) current_file, (3) imgcat_id, or (4) target parameter to class/xoopseditor/tinymce/tinymce/jscripts/tiny_mce/plugins/xoopsimagemanager/xoopsimagebrowser.php.