What’s Vulnerable › Vulnerabilities

CVE-2026-59148: Mockoon: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-09 · updated 2026-07-10
• Weakness: CWE-306

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 products

• mockoon: before 9.7.0

References

• 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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