An issue was discovered on WAGO e!DISPLAY 762-3000 through 762-3003 devices with firmware before FW 02. The vulnerability allows an authenticated user to upload arbitrary files to the file system with the permissions of the web server.
https://www.exploit-db.com/exploits/45014/
https://ics-cert.us-cert.gov/advisories/ICSA-18-198-02