Update the WordPress BP Better Messages plugin to the latest available version (at least 188.8.131.52).
Ananda Dhakal discovered and reported this Server Side Request Forgery (SSRF) vulnerability in WordPress BP Better Messages 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 184.108.40.206.