Matomo Information Disclosure Vulnerability

Matomo has been identified as vulnerable to an information disclosure issue that can be exploited by a remote, authenticated attacker. The vulnerability stems from improper handling of sensitive information, allowing an actor with valid application access to retrieve data that should remain restricted based on their privilege level. This exposure could facilitate reconnaissance or further exploitation by revealing internal system configurations, user metadata, or usage analytics that are otherwise not intended for public or lower-privilege consumption. Organizations utilizing Matomo should assess current user access permissions and monitor for unusual query patterns directed at administrative or sensitive API endpoints.

Impact

Successful exploitation results in the unauthorized disclosure of sensitive system or user information. Depending on the data exposed, this could support additional attack vectors, facilitate social engineering, or lead to privacy compliance violations. The impact is primarily focused on organizations using Matomo for analytics, as the disclosure could expose tracking data or internal system details to unauthorized users.

Recommendation

• Monitor web server logs for anomalous patterns of access to administrative or configuration-related API endpoints or files.
• Audit current Matomo user accounts and apply the principle of least privilege, ensuring that users only have the access necessary for their defined roles.
• Check for updates or patches provided by Matomo specifically addressing information disclosure vulnerabilities for the version in use.