Update the WordPress Download Monitor plugin to the latest available version (at least 4.8.2).
Mika discovered and reported this Server Side Request Forgery (SSRF) vulnerability in WordPress Download Monitor Plugin. This could allow a malicious actor to cause a website to execute website requests to an arbitrary domain of the attacker. This could allow a malicious actor to find sensitive information of other services running on the system. This vulnerability has been fixed in version 4.8.2.