FileUploadsFilter.php in X2Engine 4.1.7 and earlier, when running on case-insensitive file systems, allows remote attackers to bypass the upload blacklist and conduct unrestricted file upload attacks by uploading a file with an executable extension that contains uppercase letters, as demonstrated using a PHP program.
Cross-site scripting (XSS) vulnerability in X2Engine X2CRM before 3.5 allows remote attackers to inject arbitrary web script or HTML via the model parameter to index.php/admin/editor.
Directory traversal vulnerability in X2Engine X2CRM before 3.5 allows remote authenticated administrators to include and execute arbitrary local files via a .. (dot dot) in the file parameter to index.php/admin/translationManager.