Vulnerability in @penpot/mcp (CVE-2026-45805)
Summary
Vulnerability in @penpot/mcp (CVE-2026-45805). Successful exploitation can lead to full system takeover. Exploitable via ReplServer. Mitigation: upgrade to 2.15.0 or later.
Original description
The description as published by the source.
Penpot is an open-source design tool for design and code collaboration. Prior to 2.15.0, Penpot MCP's mcp/packages/server/src/ReplServer.ts bound the ReplServer to 0.0.0.0:4403 and exposed an unauthenticated /execute endpoint that passed the code field to PluginBridge.executePluginTask(), allowing anyone on the network to execute JavaScript on the server. This issue is fixed in version 2.15.0.
Source: GitHub Security Advisories (Global) 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-2026-45805 has been found in @penpot/mcp.
Attackers can target a specific entry point like ReplServer over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade @penpot/mcp to 2.15.0 or later.
If unsure, ask your IT team or search "@penpot/mcp CVE-2026-45805" on the vendor's site.
CVE-2026-45805 (@penpot/mcp) — CWE-749 / CVSS v3 8.8
Attack vector: adjacent-network / unauthenticated / no user interaction
Attack surface: ReplServer / PenpotMcpServer / ReplServer.ts / this.host
Patched: 2.15.0 — 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-749) exists in @penpot/mcp. Attackers reach the vulnerable code path via ReplServer without authentication.
Check the vendor advisory for the affected versions of @penpot/mcp. Attack surface: ReplServer / PenpotMcpServer / ReplServer.ts / this.host.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 2.15.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@penpot/mcp' . 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 '@penpot/mcp' . | 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
@penpot/mcpを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @penpot/mcp to 2.15.0ステージング環境で 2.15.0 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を含めること。
-
3Post-deployment verification verify
Confirm patched version is live in production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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- report github.com
- web github.com
- web github.com