{"cve":"CVE-2009-4137","nvd":{"published":"2009-12-24T16:30:00.250","modified":"2026-06-16T23:13:06.470","status":"Modified","description":"The loadContentFromCookie function in core/Cookie.php in Piwik before 0.5 does not validate strings obtained from cookies before calling the unserialize function, which allows remote attackers to execute arbitrary code or upload arbitrary files via vectors related to the __destruct function in the Piwik_Config class; php://filter URIs; the __destruct functions in Zend Framework, as demonstrated by the Zend_Log destructor; the shutdown functions in Zend Framework, as demonstrated by the Zend_Log_Writer_Mail class; the render function in the Piwik_View class; Smarty templates; and the _eval function in Smarty.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://dev.piwik.org/trac/changeset/1637","http://piwik.org/blog/2009/12/piwik-response-to-shocking-news-in-php-exploitation/","http://www.openwall.com/lists/oss-security/2009/12/09/2","http://www.openwall.com/lists/oss-security/2009/12/10/1","http://www.openwall.com/lists/oss-security/2009/12/14/2"],"products":["matomo:matomo"],"source":"nvd","synced_at":"2026-10-19T19:55:32.599380760+00:00"},"epss":{"cve":"CVE-2009-4137","score":0.16949,"percentile":0.97064,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}