CVE Catalog

CVE-2026-54504

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.57%

45th percentile - higher than 45% of all known CVEs

Summary

In MCP Documentation Server from 1.13.0 until 1.13.1, the automatically started Web UI listens on all network interfaces (port 3080) instead of localhost by default. An unauthenticated network client can call API endpoints to enumerate, read, search, insert, and delete documents, and to read configuration, thereby tampering with the MCP assistant's knowledge base. The issue is fixed in 1.13.1.

Risk Assessment

An attacker on the same LAN, VM network, container bridge, VPN, or another routed network can read, add, or delete documents and poison the AI assistant's knowledge base without authentication. This does not lead to remote code execution but can cause data leakage and manipulation of assistant responses.

Recommendation

Update MCP Documentation Server to version 1.13.1 or later. Until patched, restrict access to port 3080 via firewall or disable automatic Web UI startup.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS