Mockoon up to 9.6.x Admin API admin-api.ts information disclosure

Summaryinfo

A vulnerability was found in Mockoon up to 9.6.x. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file commons-server/src/libs/server/admin-api.ts of the component Admin API. Executing a manipulation can lead to information disclosure. This vulnerability appears as CVE-2026-59148. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Mockoon up to 9.6.x. It has been declared as problematic. This vulnerability affects some unknown processing of the file commons-server/src/libs/server/admin-api.ts of the component Admin API. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

Mockoon provides way to design and run mock APIs. Prior to 9.7.0, Mockoon's admin API in commons-server/src/libs/server/admin-api.ts is mounted on the same Express listener as user-defined mock routes, enabled by default in shipped runtimes, serves Access-Control-Allow-Origin: * with write methods allowed, and has no authentication. Any unauthenticated caller who can reach the mock server port can read MOCKOON_* environment variables, write arbitrary process environment variables through /mockoon-admin/env-vars, rewrite mock route bodies, statuses, and headers through PUT /mockoon-admin/environment, read transaction logs and SSE streams, and purge state. This issue is fixed in version 9.7.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-59148 since 07/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. 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 9.7.0 eliminates this vulnerability.

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Productinfo

Name

• Mockoon

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6

Website

• Product: https://github.com/mockoon/mockoon/

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