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CVE-2025-49596— MCP Inspector proxy server lacks authentication between the Inspector client and proxy

Quick assessment

Affected
modelcontextprotocol inspector
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.

MCP Inspector是Model Context Protocol开源的一个MCP服务器的可视化测试工具。 MCP Inspector 0.14.1之前版本存在访问控制错误漏洞，该漏洞源于缺少认证，可能导致远程代码执行。

AI Predicted 9.8 Difficulty: Trivial EPSS 44.45% · P99

Public Exploits 1

Nuclei · 1 CVE-2025-49596.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-49596

Vulnerability Information
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Vulnerability Title
MCP Inspector proxy server lacks authentication between the Inspector client and proxy
Source: CVE Program / CVE List V5
Vulnerability Description
The MCP inspector is a developer tool for testing and debugging MCP servers. Versions of MCP Inspector below 0.14.1 are vulnerable to remote code execution due to lack of authentication between the Inspector client and proxy, allowing unauthenticated requests to launch MCP commands over stdio. Users should immediately upgrade to version 0.14.1 or later to address these vulnerabilities.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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
Vulnerability Title
MCP Inspector 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Inspector是Model Context Protocol开源的一个MCP服务器的可视化测试工具。 MCP Inspector 0.14.1之前版本存在访问控制错误漏洞，该漏洞源于缺少认证，可能导致远程代码执行。
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
modelcontextprotocol inspector < 0.14.1 -

II. Public POCs for CVE-2025-49596

# POC Description Source Link Shenlong Link
1 MCP-Inspector-vulncheck is a Python script that checks if an MCP Inspector server is vulnerable to CVE-2025-49596. It tests whether the /sse endpoint responds to unauthenticated requests, indicating a potential security flaw. The script is simple to use and provides clear output on whether the target server is likely vulnerable or patched. https://github.com/ashiqrehan-21/MCP-Inspector-CVE-2025-49596 POC Details
2 The MCP inspector is a developer tool for testing and debugging MCP servers. Versions of MCP Inspector below 0.14.1 are vulnerable to remote code execution due to lack of authentication between the Inspector client and proxy, allowing unauthenticated requests to launch MCP commands over stdio. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-49596.yaml POC Details
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III. Intelligence Information for CVE-2025-49596

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IV. Related Vulnerabilities

Same product: inspector
Same vendor: modelcontextprotocol
Same weakness: CWE-306

V. Comments for CVE-2025-49596

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