source: https://www.securityfocus.com/bid/35836/info

The 'com_user' component for Joomla! is prone to a remote URI-redirection vulnerability because the application fails to properly sanitize user-supplied input.

A successful exploit may aid in phishing attacks. 

http://www.example.com/path/index.php?option=com_user&lang=fr&view=[SITE]