CVE-2025-59049

Deeper analysis

Mockoon is an open-source tool for designing and running mock APIs. Prior to version 9.2.0, its static file serving feature generated server filenames through templating driven by user-supplied input, exposing the implementation to path traversal and local file inclusion. The affected code paths reside in the commons-server package, allowing an unauthenticated remote attacker to reference arbitrary files on the mock server filesystem. The flaw carries a CVSS 3.1 score of 7.5 and is tracked under CWE-22, CWE-24, and CWE-73; it is especially relevant for cloud-hosted deployments.

An attacker can supply crafted template values in a mock API route configuration to traverse directories and retrieve any readable file from the underlying host. Because the vulnerability is exploitable over the network without authentication or user interaction, an adversary could obtain configuration secrets, source code, or other sensitive data stored on the server.

The project’s security advisory GHSA-w7f9-wqc4-3wxr and the fixing commit c7f6e23e87dc3b8cc44e5802af046200a797bd2e indicate that the issue is resolved in Mockoon 9.2.0. The patch updates filename handling to prevent traversal sequences originating from user-controlled template input.

EPSS for the CVE rose from a low baseline to a peak of 0.0622 on 2025-12-11 before receding to the current value of 0.0191, indicating a measurable increase in exploitation interest several months after disclosure.