SQL injection vulnerability in the Google Calendar GCalendar (com_gcalendar) component 1.1.2, 2.1.4, and possibly earlier versions for Joomla! allows remote attackers to execute arbitrary SQL commands via the gcid parameter. NOTE: some of these details are obtained from third party information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/54450
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-4070
http://www.securityfocus.com/bid/37141
http://www.securityfocus.com/bid/37134
http://secunia.com/advisories/37476
http://packetstormsecurity.org/0911-exploits/joomlagcalendar-sql.txt