Cross-site scripting (XSS) vulnerability in phpgwapi/js/jscalendar/test.php in EGroupware Enterprise Line (EPL) before 11.1.20110804-1 and EGroupware Community Edition before 1.8.001.20110805 allows remote attackers to inject arbitrary web script or HTML via the lang parameter.
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.