Multiple cross-site scripting (XSS) vulnerabilities in the JoomlaSeller JS Calendar (comjscalendar) component 1.5.1 and 1.5.4 for Joomla! allow remote attackers to inject arbitrary web script or HTML via the (1) month and (2) year parameters in a jscalendar action to index.php. NOTE: some of these details are obtained from third party information.