Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2009-4137

26
FAUCET Score

CVE-2009-4137 describes a critical vulnerability in Piwik (now Matomo) versions prior to 0.5, specifically within the loadContentFromCookie function in core/Cookie.php. This flaw allows remote attackers to execute arbitrary code or upload files due to improper validation of cookie-derived strings before being passed to the unserialize function. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to full compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this decade-old vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
0.2.25CPE matchmatch criteria
cpe:2.3:a:matomo:matomo:0.2.25:*:*:*:*:*:*:*
0.2.26CPE matchmatch criteria
cpe:2.3:a:matomo:matomo:0.2.26:*:*:*:*:*:*:*
0.2.27CPE matchmatch criteria
cpe:2.3:a:matomo:matomo:0.2.27:*:*:*:*:*:*:*
0.2.28CPE matchmatch criteria
cpe:2.3:a:matomo:matomo:0.2.28:*:*:*:*:*:*:*
0.2.29CPE matchmatch criteria
cpe:2.3:a:matomo:matomo:0.2.29:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
16.95%
Probability of exploitation in next 30 days
EPSS Percentile
96.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1695 is in the 95th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

dev.piwik.org / trac/changeset/1637
Vendor Advisory
piwik.org / blog/2009/12/piwik-response-to-shocking-news-in-php-exploitation
Vendor Advisory
openwall.com / lists/oss-security/2009/12/09/2
openwall.com / lists/oss-security/2009/12/10/1
openwall.com / lists/oss-security/2009/12/14/2
sektioneins.de / en/advisories/advisory-032009-piwik-cookie-unserialize-vulnerability
suspekt.org / 2009/12/09/advisory-032009-piwik-cookie-unserialize-vulnerability
suspekt.org / downloads/POC2009-ShockingNewsInPHPExploitation.pdf