Update the WordPress Easy Digital Downloads plugin to the latest available version (at least 188.8.131.52.2).
Nguyen Anh Tien discovered and reported this Privilege Escalation vulnerability in WordPress Easy Digital Downloads Plugin. This could allow a malicious actor to escalate their low privileged account to something with higher privileges. After this they could take full control of the website if high privileges are gained. This vulnerability has been fixed in version 184.108.40.206.2.