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CVE-2026-55604— @arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key

Quick assessment

Affected
arikusi deepseek-mcp-server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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1.7.0之前版本存在授权问题漏洞，该漏洞源于进程全局的SessionStore接受调用者提供的session_id值而未绑定到任何经过身份验证的主体或传输会话，可能导致攻击者通过deepseek_sessions枚举活动会话ID，并在deepseek_chat中重用受害者控制的session_id来检索和继续受害者的对话环境。

CVSS 8.6 · High EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
arikusi deepseek-mcp-server >= 1.4.2, < 1.7.0 affected
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I. Basic Information for CVE-2026-55604

Vulnerability Information
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Vulnerability Title
@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key
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 1.7.0, the process-global `SessionStore` accepts caller-supplied `session_id` values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via `deepseek_sessions`, then reuse a victim-controlled `session_id` in `deepseek_chat` to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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1.7.0之前版本存在授权问题漏洞，该漏洞源于进程全局的SessionStore接受调用者提供的session_id值而未绑定到任何经过身份验证的主体或传输会话，可能导致攻击者通过deepseek_sessions枚举活动会话ID，并在deepseek_chat中重用受害者控制的session_id来检索和继续受害者的对话环境。
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

Vendor Product Affected Versions CPE Subscribe
arikusi deepseek-mcp-server >= 1.4.2, < 1.7.0 -

II. Public POCs for CVE-2026-55604

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7577 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-55604

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Vendor Advisories for CVE-2026-55604 (1)

Vendor Pages for CVE-2026-55604 (1)

IV. Related Vulnerabilities

Same product: deepseek-mcp-server
Same vendor: arikusi
Same weakness: CWE-639