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CVE-2026-54504— MCP Documentation Server: Web UI API binds to all interfaces without authentication by default

Quick assessment

Affected
andrea9293 mcp-documentation-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP 文档服务器是一款面向 AI 编码代理的本地优先文档管理与语义搜索服务器。在版本 1.13.0 至 1.13.1 之间， 中自动启动的 Web UI 会以默认启用 且 设置为 3080 的参数调用 中的 函数。该函数通过 启动服务时未指定主机地址，导致未经身份验证的文档管理 API 绑定到所有网络接口，而非仅限 。因此，处于网络可达状态的客户端无需凭据即可调用以下接口： 、 、 、 、 以及 ，从而枚举和读取文档、搜索语料库、插入或删除文档，并篡改 MCP 助手的知识库。攻击者需能够通过网络访问该服务（例如通

CVSS 8.8 · High

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
andrea9293 mcp-documentation-server >= 1.13.0, < 1.13.1 affected
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I. Basic Information for CVE-2026-54504

Vulnerability Information
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Vulnerability Title
MCP Documentation Server: Web UI API binds to all interfaces without authentication by default
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
andrea9293 mcp-documentation-server >= 1.13.0, < 1.13.1 -

II. Public POCs for CVE-2026-54504

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III. Intelligence Information for CVE-2026-54504

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Patches & Fixes for CVE-2026-54504 (1)

Vendor Advisories for CVE-2026-54504 (1)

Vendor Pages for CVE-2026-54504 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-54504

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