Cross-site request forgery (CSRF) vulnerability in the AdminObserver function in e107_admin/users.php in e107 2.0 alpha2 allows remote attackers to hijack the authentication of administrators for requests that add users to the administrator group via the id parameter in an admin action.
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.