boroeurnprach/cve-2026-23744-poc
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.
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.
| Vulnerability Source | Affected Versions | Patched Versions |
|---|
@mcpjam/inspector | <= 1.4.2 | 1.4.3 |
npx @mcpjam/[email protected]
python3 exploit.py <target_ip> 'id > /tmp/mcpjam_pwned.txt'
![[Pasted image 20260120135006.png]](https://github.com/boroeurnprach/CVE-2026-23744-PoC/blob/main/Assets/Pasted%20image%2020260120135006.png)
In victim server:
![[Pasted image 20260120135151.png]](https://github.com/boroeurnprach/CVE-2026-23744-PoC/blob/main/Assets/Pasted%20image%2020260120135151.png)
![[Pasted image 20260120150109.png]](https://github.com/boroeurnprach/CVE-2026-23744-PoC/blob/main/Assets/Pasted%20image%2020260120150109.png)