CVE-2026-59148

Mockoon: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft

Published Jul 9, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
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

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-rqx4-3f6q-3x2v @Mockoon/commons-server: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mockoon
Mockoon mockoon
Vendors & Products Mockoon
Mockoon mockoon
Type Values Removed Values Added
Description 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.
Title Mockoon: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft
Weaknesses CWE-306
CWE-352
CWE-732
CWE-942
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 9, 2026, 7:24 PM
Reserved
Jul 2, 2026, 4:50 PM
Status
Deferred
Published
Jul 9, 2026, 7:17 PM
Modified
Jul 10, 2026, 7:15 PM