The current version of Matomo (Piwik) (1.8.2) is not affected by this vulnerability. Matomo neither uses nor includes the XmlRpc component from Zend Framework.

Matomo (Piwik) users are, however, encouraged to upgrade to the latest versions of Matomo and PHP to take advantage of new features and bug fixes.

References:

  • ZF2011-01: Local file disclosure via XXE injection in Zend_XmlRpc
  • CVE-2012-3363

Any questions?

Many answers and more information about Matomo you can find here:

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