Directory traversal vulnerability in core/ViewDataTable/Factory.php in Piwik before 2.15.0 allows remote attackers to include and execute arbitrary local files via the viewDataTable parameter.
https://piwik.org/changelog/piwik-2-15-0/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-7713
http://www.securityfocus.com/archive/1/536838/100/0/threaded
http://seclists.org/fulldisclosure/2015/Nov/14
http://packetstormsecurity.com/files/134219/Piwik-2.14.3-Local-File-Inclusion.html