Multiple SQL injection vulnerabilities in MyioSoft EasyCalendar 4.0tr and earlier allow remote attackers to execute arbitrary SQL commands via the (1) year parameter in a dayview action to plugins/calendar/calendar_backend.php and the (2) page parameter to ajaxp_backend.php.
https://www.exploit-db.com/exploits/5246
https://exchange.xforce.ibmcloud.com/vulnerabilities/41179
http://www.securityfocus.com/archive/1/489678/100/0/threaded