---
title: "CVE-2026-23744: REC in MCPJam inspector due to HTTP Endpoint exposes"
url: https://erroneo.us/security/cve/CVE-2026-23744/
description: "CVE-2026-23744 (@mcpjam/inspector (npm)): MCPJam inspector is the local-first development platform for MCP servers. Versions 1.4.2 and earlier are…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-01-16
date_modified: 2026-01-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-23744"
kev: false
cvss: 9.8
epss: 0.67516
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** High exploit likelihood. EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 67.5% , percentile 99: FIRST’s model estimates a 67.5% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @mcpjam/inspector (npm) <= 1.4.2, fixed in 1.4.3 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `@mcpjam/inspector` <= 1.4.2 → fixed: 1.4.3

## Affected products (CVE record)

- MCPJam inspector: <= 1.4.2

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 67.52% probability of exploitation activity in the next 30 days; percentile 99.

## Sources

- [GitHub Advisory GHSA-232v-j27c-5pp6](https://github.com/advisories/GHSA-232v-j27c-5pp6)
- [CVE.org record CVE-2026-23744](https://www.cve.org/CVERecord?id=CVE-2026-23744)
- [NVD entry CVE-2026-23744](https://nvd.nist.gov/vuln/detail/CVE-2026-23744)
- [github.com](https://github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6)
- [github.com](https://github.com/MCPJam/inspector/commit/e6b9cf9d9e6c9cbec31493b1bdca3a1255fe3e7a)

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Source page: https://erroneo.us/security/cve/CVE-2026-23744/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt