WordPress Plugin Gravity Upload Ajax is prone to a vulnerability that lets attackers upload arbitrary files because the application fails to properly verify user-supplied input. An attacker can exploit this vulnerability to upload arbitrary code and run it in the context of the webserver process. This may facilitate unauthorized access or privilege escalation; other attacks are also possible. WordPress Plugin Gravity Upload Ajax version 1.1 is vulnerable; prior versions may also be affected.
Edit the source code to ensure that file types are filtered prior to accepting an upload and place a .htaccess file in gravity_forms directory that prevents PHP/script execution under it