Multiple cross-site scripting (XSS) vulnerabilities in calendar.class.php in ApPHP Calendar (ApPHP CAL) allow remote attackers to inject arbitrary web script or HTML via the (1) category_name, (2) category_description, (3) event_name, or (4) event_description parameter.
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.