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CVE-2026-23744— REC in MCPJam inspector due to HTTP Endpoint exposes

Quick assessment

Affected
MCPJam 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.

MCPJam Inspector是MCPJam开源的一个针对模型上下文协议的开源调试与质量分析工具。 MCPJam inspector 1.4.2及之前版本存在安全漏洞，该漏洞源于特制HTTP请求可触发MCP服务器安装，可能导致远程代码执行。

CVSS 9.8 · Critical EPSS 67.52% · P99

Public Exploits 3

ExploitDB · 1 EDB-52625 [webapps]
Metasploit · 1 mcpjam_inspector_rce.rb [exploit]
Nuclei · 1 CVE-2026-23744.yaml [template]
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I. Basic Information for CVE-2026-23744

Vulnerability Information
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Vulnerability Title
REC in MCPJam inspector due to HTTP Endpoint exposes
Source: CVE Program / CVE List V5
Vulnerability Description
MCPJam inspector is the local-first development platform for MCP servers. Versions 1.4.2 and earlier are vulnerable to remote code execution (RCE) vulnerability, which allows an attacker to send a crafted HTTP request that triggers the installation of an MCP server, leading to RCE. Since MCPJam inspector by default listens on 0.0.0.0 instead of 127.0.0.1, an attacker can trigger the RCE remotely via a simple HTTP request. Version 1.4.3 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: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
Vulnerability Title
MCPJam Inspector 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCPJam Inspector是MCPJam开源的一个针对模型上下文协议的开源调试与质量分析工具。 MCPJam inspector 1.4.2及之前版本存在安全漏洞，该漏洞源于特制HTTP请求可触发MCP服务器安装，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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
MCPJam inspector <= 1.4.2 -

II. Public POCs for CVE-2026-23744

# POC Description Source Link Shenlong Link
1 MCPJam inspector is the local-first development platform for MCP servers. The Latest version 1.4.2 and earlier are vulnerable to a remote code execution (RCE) vulnerability, which allows an attacker to send a crafted HTTP request that triggers the installation of an MCP server, leading to RCE. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-23744.yaml POC Details
2 CVE-2026-23744 - Versions 1.4.2 and earlier of MCPJam inspector are vulnerable to remote code execution (RCE). Because the tool listens on 0.0.0.0 by default, an attacker can trigger the installation and execution of a malicious MCP server by sending a crafted HTTP request. Version 1.4.3 contains a patch for this issue. https://github.com/boroeurnprach/CVE-2026-23744-PoC POC Details
3 None https://github.com/rootdirective-sec/CVE-2026-23744-Lab POC Details
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III. Intelligence Information for CVE-2026-23744

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IV. Related Vulnerabilities

Same product: inspector
Same weakness: CWE-306

V. Comments for CVE-2026-23744

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