Vulnerability in Matomo

CVE-2015-7816

The DisplayTopKeywords function in plugins/Referrers/Controller.php in Piwik before 2.15.0 allows remote attackers to conduct PHP object injection attacks, conduct Server-Side Request Forgery (SSRF) attacks, and execute arbitrary PHP code via a crafted HTTP header.

Published 2015-11-16 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 7.5 (High). Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.039 (90.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.039 · newest: 0.039 · change: 0.000

Affected products

Matomo

References

karmainsecurity.com/KIS-2015-10 (Exploit)
seclists.org/fulldisclosure/2015/Nov/15 (mailing-list, Exploit)
packetstormsecurity.com/files/134220/Piwik-2.14.3-PHP-Object-Injection.html (Exploit)
piwik.org/changelog/piwik-2-15-0/ (Vendor Advisory)
www.securityfocus.com/archive/1/536839/100/0/threaded (mailing-list)