Information disclosure - Criticality: Low
http://www.planetice.net/langur/piwik.php?idsite=1
To run Piwik you need at least PHP version 5.5.9
Unfortunately it seems your webserver is using PHP version 5.4.45-0+deb7u8.
Please try to update your PHP version, Piwik is really worth it! Nowadays most web hosts support PHP 5.5.9.