Directory traversal vulnerability in the GCalendar (com_gcalendar) component 2.1.5 for Joomla! allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the controller parameter to index.php.
https://exchange.xforce.ibmcloud.com/vulnerabilities/56863
https://euvd.enisa.europa.eu/vulnerability/EUVD-2010-0997