Vulnerability in @mockoon/commons-server (CVE-2026-59148)
Summary
Vulnerability in @mockoon/commons-server (CVE-2026-59148). Successful exploitation can lead to full system takeover. Exploitable via PUT /mockoon-admin/environment. Mitigation: upgrade to 9.7.0 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-59148 has been found in @mockoon/commons-server.
Attackers can target a specific entry point like PUT /mockoon-admin/environment over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade @mockoon/commons-server to 9.7.0 or later.
If unsure, ask your IT team or search "@mockoon/commons-server CVE-2026-59148" on the vendor's site.
CVE-2026-59148 (@mockoon/commons-server) — CWE-306 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: PUT /mockoon-admin/environment / GET /users/ / PUT /environment / GET /mockoon-admin/events
Patched: 9.7.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-306) exists in @mockoon/commons-server. Attackers reach the vulnerable code path via PUT /mockoon-admin/environment without authentication.
Check the vendor advisory for the affected versions of @mockoon/commons-server. Attack surface: PUT /mockoon-admin/environment / GET /users/ / PUT /environment / GET /mockoon-admin/events.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 9.7.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual PUT /mockoon-admin/environment requests with malformed payloads or SQL meta-characters. Run grep -r '@mockoon/commons-server' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@mockoon/commons-server' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@mockoon/commons-serverを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'PUT /mockoon-admin/environment' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
PUT /mockoon-admin/environmentへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Apply patch patch
Upgrade @mockoon/commons-server to 9.7.0ステージング環境で 9.7.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 2 で見つけた異常検知の続報チェックを含めること。
-
4Post-deployment verification verify
Replay attack against PUT /mockoon-admin/environment on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- patch github.com
- patch github.com
- web github.com
- web mockoon.com
- web github.com