Multiple unspecified vulnerabilities in Joomla! before 1.0.12 have unknown impact and attack vectors related to (1) "unneeded legacy functions" and (2) "Several low level security fixes."
http://www.vupen.com/english/advisories/2006/5202
http://www.securityfocus.com/bid/21810
http://www.joomla.org/content/view/2495/78/
http://www.joomla.org/content/view/2446/1/