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CRITICAL

CVE-2026-23744

CVSS v3

9.8

CRITICAL

EPSS Score

29.4 %

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

CVSS v3 Vector
3.1
Published
2026-01-16
Last Modified
2026-03-13
Exploit-DB
EDB-52625

Frequently asked questions

What is CVE-2026-23744?

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.

Is CVE-2026-23744 actively exploited?

Active exploitation of CVE-2026-23744 has not been confirmed. The EPSS score is 29.4%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-23744?

CVE-2026-23744 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.

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