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CVE-2026-55605— @arikusi/deepseek-mcp-server Missing Authentication on Self-Hosted HTTP MCP Endpoint

CVSS 5.3 · Medium EPSS 0.43% · P36

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
arikusideepseek-mcp-server>= 1.4.2, < 1.8.0affected
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I. Basic Information for CVE-2026-55605

Vulnerability Information
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Vulnerability Title
@arikusi/deepseek-mcp-server Missing Authentication on Self-Hosted HTTP MCP Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.8.0, the self-hosted HTTP transport of `@arikusi/deepseek-mcp-server` exposes `POST /mcp` without any authentication: `createMcpExpressApp` is called without an `authProvider` and no middleware guards the route, so any network-reachable client can issue an unauthenticated `initialize` request and obtain a valid MCP session identifier. In reproduced testing against commit `5e1302171e99`, an unauthenticated client was able to initialize a session, enumerate tools, and invoke the local `deepseek_sessions` tool with no credentials. The same unauthenticated session also exposes `deepseek_chat`, whose handler uses the server-side `DEEPSEEK_API_KEY` when self-hosted deployments configure one. This issue applies to self-hosted HTTP mode, not the separately documented hosted BYOK endpoint in `README.md`, which expects an `Authorization: Bearer ...` header. Upstream self-hosted container assets enable HTTP mode by default (`Dockerfile`) and publish port `3000` (`docker-compose.yml`). Version 1.8.0 contains a patch for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
Vulnerability Title
tahir DeepSeek MCP Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tahir DeepSeek MCP Server是tahir个人开发者的一个实现MCP的服务器。 tahir DeepSeek MCP Server 1.4.2版本至1.8.0之前版本存在授权问题漏洞，该漏洞源于自托管HTTP传输暴露`POST /mcp`接口且未进行身份验证，可能导致任何网络可达客户端发起未认证的初始化请求并获取有效MCP会话标识符，进一步枚举工具及调用本地工具，在配置了服务器端API密钥时还可能暴露聊天功能。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
arikusideepseek-mcp-server >= 1.4.2, < 1.8.0 -

II. Public POCs for CVE-2026-55605

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III. Intelligence Information for CVE-2026-55605

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Patches & Fixes for CVE-2026-55605 (1)

Vendor Advisories for CVE-2026-55605 (1)

Other References for CVE-2026-55605 (1)

IV. Related Vulnerabilities

Same product: deepseek-mcp-server
Same vendor: arikusi
Same weakness: CWE-306

V. Comments for CVE-2026-55605

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