secunia reports:
Stefan Esser has reported a vulnerability in Piwik, which can be exploited by malicious people to compromise a vulnerable system.
The vulnerability is caused due to the core/Cookie.php script using "unserialize()" with user controlled input. This can be exploited to e.g. execute arbitrary PHP code via the "__wakeup()" or "__destruct()" methods of a serialized object passed via an HTTP cookie.
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