{"cve":"CVE-2011-0398","nvd":{"published":"2011-01-10T20:00:17.140","modified":"2026-06-16T23:27:16.883","status":"Modified","description":"The Piwik_Common::getIP function in Piwik before 1.1 does not properly determine the client IP address, which allows remote attackers to bypass intended geolocation and logging functionality via (1) use of a private (aka RFC 1918) address behind a proxy server or (2) spoofing of the X-Forwarded-For HTTP header.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-264"],"references":["http://dev.piwik.org/trac/ticket/567","http://osvdb.org/70384","http://piwik.org/blog/2011/01/piwik-1-1-2/","http://www.securityfocus.com/bid/45787","https://exchange.xforce.ibmcloud.com/vulnerabilities/64641"],"products":["matomo:matomo"],"source":"nvd","synced_at":"2026-10-19T19:57:56.749847046+00:00"},"epss":{"cve":"CVE-2011-0398","score":0.01338,"percentile":0.71269,"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."]}