CVE-2025-34104
Published: 15 July 2025
Summary
CVE-2025-34104 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Matomo (inferred from references). Its CVSS base score is 9.4 (Critical).
Operationally, ranked in the top 1.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
An authenticated remote code execution vulnerability exists in Piwik, now known as Matomo, in versions prior to 3.0.3. The flaw resides in the plugin upload mechanism and stems from missing authentication checks combined with unrestricted file upload of dangerous types, allowing a Superuser to supply a malicious ZIP archive that executes arbitrary PHP code on the server.
An attacker with valid Superuser credentials can exploit the issue over the network by uploading and activating a crafted plugin, achieving full system compromise including code execution, data access, and persistence. The attack requires no user interaction beyond the initial authenticated session and succeeds with low attack complexity against exposed instances.
Advisories and the Matomo changelog for version 3.0.3 state that plugin upload functionality is disabled by default thereafter and must be explicitly re-enabled via the configuration file if needed. Public references also include a Metasploit module that implements the plugin-upload technique and a detailed technical write-up demonstrating the attack path.
The EPSS score for this CVE stands at 0.7356 with no material change from its recorded peak.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-21429
Vulnerability details
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…
more
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Requires established identification and authentication to unlock, mitigating missing authentication for continued system access.
Requiring identification and rationale for actions allowed without authentication ensures critical functions are not left unprotected by forcing review of authentication requirements.
Authorizing mobile device connections to organizational systems ensures authentication is performed for this critical access function.
Guarantees critical functions are protected by mandatory invocation of the access control mechanism.
Auditing sessions makes it possible to detect access to critical functions without required authentication.
The assessment process confirms authentication is present and effective for critical functions, preventing exploitation from missing authentication.
Certification assesses that critical functions have required authentication controls in place.
Disabling non-essential functions and services eliminates the need to secure them, reducing exposure from missing authentication on unnecessary components.