Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M
CVE-2026-59148Mockoon: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft
High 8.8
In plain English
A high-severity missing authentication in mockoon from mockoon. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @mockoon/cli | 9.7.0 | GHSA-rqx4-3f6q-3x2v |
| npm | @mockoon/commons-server | 9.7.0 | GHSA-rqx4-3f6q-3x2v |
Affected products (as reported)
Weakness: CWE-306, CWE-352, CWE-732, CWE-942 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/mockoon/mockoon/security/advisories/GHSA-rqx4-3f6q-3x2v x_refsource_CONFIRM
- https://github.com/mockoon/mockoon/pull/2254 x_refsource_MISC
- https://github.com/mockoon/mockoon/commit/c420b5a56918475b8663977b51e5f986e45b3299 x_refsource_MISC
- https://github.com/mockoon/mockoon/releases/tag/v9.7.0 x_refsource_MISC
- https://mockoon.com/releases/9.7.0 x_refsource_MISC