Cross-site scripting (XSS) vulnerability in plugins/calendar/calendar_backend.php in MyioSoft EasyCalendar 4.0tr and earlier allows remote attackers to inject arbitrary web script or HTML via the day parameter in a dayview action.
Improper Neutralization of Input During Web Page Generation The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.