SQL injection vulnerability in the K2 (com_k2) component 1.0.1 Beta and earlier for Joomla! allows remote attackers to execute arbitrary SQL commands via the category parameter in an itemlist action to index.php.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-2391
http://www.vupen.com/english/advisories/2009/1733