SQL injection vulnerability in the beamospetition (com_beamospetition) 1.0.12 component for Joomla! allows remote attackers to execute arbitrary SQL commands via the mpid parameter in a sign action to index.php, a different vector than CVE-2008-3132.
https://www.exploit-db.com/exploits/7847
http://www.securityfocus.com/archive/1/500250/100/0/threaded