server_user_groups.php in phpMyAdmin 4.1.x before 4.1.14.2 and 4.2.x before 4.2.6 allows remote authenticated users to bypass intended access restrictions and read the MySQL user list via a viewUsers request.
https://security.gentoo.org/glsa/201505-03
https://github.com/phpmyadmin/phpmyadmin/commit/395265e9937beb21134626c01a21f44b28e712e5
http://www.securityfocus.com/bid/68804
http://www.phpmyadmin.net/home_page/security/PMASA-2014-7.php
http://secunia.com/advisories/60397
http://lists.opensuse.org/opensuse-updates/2014-08/msg00045.html