---
id: CVE-2026-59148
title: Mockoon provides way to design and run mock APIs
summary: >-
  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 runti…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-306
  - CWE-352
  - CWE-732
  - CWE-942
vendor: mockoon
product: mockoon
affected:
  - mockoon < 9.7.0
published: '2026-07-09'
updated: '2026-07-10'
sourceUpdated: '2026-07-10T19:15:15.780'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59148'
references:
  - url: >-
      https://github.com/mockoon/mockoon/commit/c420b5a56918475b8663977b51e5f986e45b3299
    label: security-advisories@github.com
  - url: 'https://github.com/mockoon/mockoon/pull/2254'
    label: security-advisories@github.com
  - url: 'https://github.com/mockoon/mockoon/releases/tag/v9.7.0'
    label: security-advisories@github.com
  - url: 'https://github.com/mockoon/mockoon/security/advisories/GHSA-rqx4-3f6q-3x2v'
    label: security-advisories@github.com
  - url: 'https://mockoon.com/releases/9.7.0'
    label: security-advisories@github.com
  - url: 'https://github.com/mockoon/mockoon/security/advisories/GHSA-rqx4-3f6q-3x2v'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-09T19:24:39.649769Z'
ingestedAt: '2026-09-14T14:00:59.107Z'
epss: 0.00262
epssPercentile: 0.16044
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.