SQL injection vulnerability in cpabc_appointments_admin_int_calendar_list.inc.php in the Appointment Booking Calendar plugin before 1.1.8 for WordPress allows remote attackers to execute arbitrary SQL commands via unspecified vectors related to updating the username.
https://wpvulndb.com/vulnerabilities/8199
https://wordpress.org/plugins/appointment-booking-calendar/changelog/
http://www.securityfocus.com/archive/1/536555/100/0/threaded