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8.8

MCP Documentation Server exposes document API to network

CVE-2026-54504 · published 1 month ago
Summary

Versions 1.13.0 through 1.13.1 of the MCP Documentation Server start a web interface that listens on all network interfaces without requiring a login. This allows anyone on the same network to read, add, delete, or search your stored documents and change configuration. Upgrade to version 1.13.1 or later, or restrict the server to listen only on localhost, to stop unauthorized access.

What to do
  • Update andrea9293 mcp-documentation-server to version 1.13.1.
Affected software
Ecosystem VendorProductAffected versions
npm andrea9293 mcp-documentation-server 1.13.0
Fix: upgrade to 1.13.1
– andrea9293 mcp-documentation-server >= 1.13.0, < 1.13.1
Original advisory text
MCP Documentation Server: Web UI API binds to all interfaces without authentication by default
MCP Documentation Server is a local-first document management and semantic search server for AI coding agents. From 1.13.0 until 1.13.1, the automatically started Web UI in src/server.ts calls startWebServer in src/web-server.ts with START_WEB_UI enabled by default and WEB_PORT set to 3080. startWebServer uses app.listen(PORT) without a host, which binds the unauthenticated document-management API to all interfaces rather than localhost. A network-reachable client can invoke GET /api/documents, GET /api/documents/:id, POST /api/documents, POST /api/search-all, DELETE /api/documents/:id, and GET /api/config without credentials to enumerate and read documents, search the corpus, insert or delete documents, and tamper with the MCP assistant's knowledge base. The service must be reachable from the attacker's LAN, VM network, container bridge, VPN, or another routed network, and the issue does not provide remote code execution. This issue is fixed in 1.13.1.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-306Missing Authentication for Critical Function
CWE-668Exposure of Resource to Wrong Sphere
Timeline
Published17 Sep 2026
Updated4 Nov 2026
First seen16 Jul 2026
Sources
GHSA-6f5r-5672-72j7 · GHSA
CVE-2026-54504 · NVD
CVE-2026-54504 · MITRE
CVE-2026-54504 · OSV
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