ZenHive mpp up to 0.16.1 lib/mpp/plug.ex MPP.Plug.verify_credential information disclosure

Summaryinfo

A vulnerability categorized as problematic has been discovered in ZenHive mpp up to 0.16.1. This impacts the function MPP.Plug.verify_credential of the file lib/mpp/plug.ex. The manipulation results in information disclosure. This vulnerability is identified as CVE-2026-89186. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in ZenHive mpp up to 0.16.1. It has been classified as problematic. Affected is the function MPP.Plug.verify_credential of the file lib/mpp/plug.ex. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

Use of Cache Containing Sensitive Information in ZenHive mpp allows a shared HTTP cache to store a paid response and serve it to clients that never paid. MPP.Plug.verify_credential in lib/mpp/plug.ex sets payment-receipt and cache-control: private on the connection before the wrapped application runs, and registers no register_before_send/2 callback. Plug.Conn.put_resp_header/3 replaces an existing header, so a mounting application that sets its own cache-control on the paid resource (for example public, max-age=3600) silently overrides the private the library relies on, and a CDN or reverse proxy can then store the paid 200 together with its Payment-Receipt and serve both to unpaid clients. The library-level guarantee is therefore defeatable by the application it protects. For the same reason a downstream non-2xx response still carried Payment-Receipt, issuing a receipt for a response that delivered no resource. This issue affects mpp: from 0.1.0 before 0.16.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-89186 since 09/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 0.16.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-80254). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• ZenHive

Name

• mpp

Version

• 0.16.0
• 0.16.1

Website

• Product: https://github.com/ZenHive/mpp/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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