CVE-2025-34104
CVE-2025-34104 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.
Key facts
- Severity: Critical (CVSS 4.0 base score 9.4)
- EPSS exploit prediction: 1% (55th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-21429
- Weakness: CWE-306
- Published:
- Last modified:
Description
An authenticated remote code execution vulnerability exists in Piwik (now Matomo) versions prior to 3.0.3 via the plugin upload mechanism. In vulnerable versions, an authenticated user with Superuser privileges can upload and activate a malicious plugin (ZIP archive), leading to arbitrary PHP code execution on the underlying system. Starting with version 3.0.3, plugin upload functionality is disabled by default unless explicitly enabled in the configuration file.
Frequently asked questions
- What is CVE-2025-34104?
- An authenticated remote code execution vulnerability exists in Piwik (now Matomo) versions prior to 3.0.3 via the plugin upload mechanism. In vulnerable versions, an authenticated user with Superuser privileges can upload and activate a malicious plugin (ZIP archive), leading to arbitrary PHP code execution on the underlying system. Starting with version 3.0.3, plugin upload functionality is disabled by default unless explicitly enabled in the configuration file.
- How severe is CVE-2025-34104?
- CVE-2025-34104 has a CVSS 4.0 base score of 9.4, rated critical severity.
- Is CVE-2025-34104 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-34104?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-34104 have an EU (EUVD) identifier?
- Yes. CVE-2025-34104 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21429.
- When was CVE-2025-34104 published?
- CVE-2025-34104 was published on 2025-07-15 and last updated on 2026-06-17.
References
- https://firefart.at/post/turning_piwik_superuser_creds_into_rce/
- https://matomo.org/changelog/piwik-3-0-3/
- https://matomo.org/faq/plugins/faq_21/
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/piwik_superuser_plugin_upload.rb
- https://www.vulncheck.com/advisories/piwik-authenticated-rce-via-custom-plugin-upload
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