The Piwik security advisory reports:
The Piwik 1.5 release addresses a critical security vulnerability, which affect all Piwik users that have let granted some access to the "anonymous" user.
Piwik contains a remotely exploitable vulnerability that could allow a remote attacker to execute arbitrary code. Only installations that have granted untrusted view access to their stats (ie. grant "view" access to a website to anonymous) are at risk.
Disclaimer: The data contained on this page is derived from the VuXML document, please refer to the the original document for copyright information. The author of portaudit makes no claim of authorship or ownership of any of the information contained herein.
If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Team. Refer to "FreeBSD Security Information" for more information.