An issue was discovered in Appnitro MachForm before 4.2.3. When the form is set to filter a blacklist, it automatically adds dangerous extensions to the filters. If the filter is set to a whitelist, the dangerous extensions can be bypassed through ap_form_elements SQL Injection.
Unrestricted file upload vulnerability in view.php in Machform 2 allows remote attackers to execute arbitrary PHP code by uploading a PHP file, then accessing it via a direct request to the file in the upload form's directory in data/.
Cross-site scripting (XSS) vulnerability in view.php in Machform 2 allows remote attackers to inject arbitrary web script or HTML via the element_2 parameter.