andrea9293 MCP Documentation Server up to 1.13.0 Web UI src/web-server.ts startWebServer access control

Summaryinfo

A vulnerability marked as critical has been reported in andrea9293 MCP Documentation Server up to 1.13.0. This affects the function startWebServer of the file src/web-server.ts of the component Web UI. This manipulation causes access control. This vulnerability is tracked as CVE-2026-54504. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in andrea9293 MCP Documentation Server up to 1.13.0. Affected by this vulnerability is the function startWebServer of the file src/web-server.ts of the component Web UI. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-54504 since 06/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 1.13.1 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• andrea9293

Name

• MCP Documentation Server

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13.0

CPE 2.3info

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CPE 2.2info

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• 🔒
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