Multiple unspecified vulnerabilities in Joomla! before 1.0.11 allow attackers to bypass user authentication via unknown vectors involving the (1) do_pdf command and the (2) emailform com_content task.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28632
http://www.vupen.com/english/advisories/2006/3408
http://www.joomla.org/content/view/1843/74/