A directory traversal vulnerability in the obSuggest (com_obsuggest) component before 1.8 for Joomla! allows remote attackers to read arbitrary files via a .. (dot dot) in the controller parameter to index.php.
View the template here CVE-2011-4804.yaml
References:
http://foobla.com/news/latest/obsuggest-1.8-security-release.html