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Vulnerability record · CVE-2026-59148 · published 9 July 2026

CVE-2026-59148: Missing authentication for critical function vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.26% · top 83.8% CWE-306 · Missing authentication for critical functionCWE-352 · Cross-site request forgery Deferred
8.8CVSS 3.1 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
10 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/mockoon/mockoon/commit/c420b5a56918475b8663977b51e5f986e45b3299
https://github.com/mockoon/mockoon/pull/2254
https://github.com/mockoon/mockoon/releases/tag/v9.7.0
https://github.com/mockoon/mockoon/security/advisories/GHSA-rqx4-3f6q-3x2v
https://mockoon.com/releases/9.7.0
https://github.com/mockoon/mockoon/security/advisories/GHSA-rqx4-3f6q-3x2v

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Source: NIST National Vulnerability Database (record CVE-2026-59148), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.