Mockoon: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-59148
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:13 UTC · Revision 1
Source evidence
Mockoon: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft
core-osv · Original sourcePublished 9 Jul 2026, 18:27 UTC
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.
osv:CVE-2026-59148
Complete source record
{
"id": "d48bd303c66ab86407e9c2b48d620f29cdce5ac196c682a62eb033a23cd49a59",
"url": "https://osv.dev/vulnerability/CVE-2026-59148",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Mockoon: Unauthenticated admin API + wildcard CORS allows mock-state hijack and secret theft",
"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 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.",
"evidence": "osv:CVE-2026-59148",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-59148",
"aliases": [
"CVE-2026-59148",
"GHSA-rqx4-3f6q-3x2v"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mockoon/mockoon",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "51eaa94c8d83b9af99b64da10f2b5c383acd8a4c"
},
{
"fixed": "c420b5a56918475b8663977b51e5f986e45b3299"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "9.7.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "c420b5a56918475b8663977b51e5f986e45b3299"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "51eaa94c8d83b9af99b64da10f2b5c383acd8a4c"
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],
"source": "REFERENCES_TAG",
"original_tag": "v9.7.0"
}
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}
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59148.json"
}
}
],
"modified": "2026-10-28T02:30:29.226057892Z",
"provider": "osv",
"references": [
"https://github.com/mockoon/mockoon/releases/tag/v9.7.0",
"https://mockoon.com/releases/9.7.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59148.json",
"https://github.com/mockoon/mockoon/security/advisories/GHSA-rqx4-3f6q-3x2v",
"https://nvd.nist.gov/vuln/detail/CVE-2026-59148",
"https://github.com/mockoon/mockoon/commit/c420b5a56918475b8663977b51e5f986e45b3299",
"https://github.com/mockoon/mockoon/pull/2254"
],
"provider_metadata": {
"cwe_ids": [
"CWE-306",
"CWE-352",
"CWE-732",
"CWE-942"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59148.json"
}
},
"related_cves": [
{
"value": "CVE-2026-59148",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496245,
"published_at": "2026-07-09T18:27:18.579+00:00"
}