The Better Messages plugin for WordPress, BuddyPress, PeepSo, Ultimate Member, and BuddyBoss is not secure in versions up to 2.7.4. This vulnerability, known as Server-Side Request Forgery, allows attackers to make web requests from the plugin to any location they choose. This can be used to access and change information from internal services. To exploit this vulnerability, the “Enable link previews” option must be turned on (which is usually the default setting).