Cross Site Request Forgery (CSRF) vulnerability exists in the 'pvmsg.php?action=add_message', pvmsg.php?action=confirm_delete , and ajax.server.php?page=user&action=flip_follow endpoints in Ampache <= 6.6.0.
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.