CVE-2026-23744

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: CRITICAL
CVSS score: 9.8 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Effective score: 9.8 / 10 CRITICAL source: CNA overview
CWE(s): CWE-306
Reserved: 2026-01-15
Published: 2026-01-16 20:10 UTC
Last updated: 2026-01-16 21:15 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23744.json
Linked Threat: CVE-2026-23744 — REC in MCPJam inspector due to HTTP Endpoint exposes

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-01-16 20:15:51 UTC
NVD last modified: 2026-03-13 14:19:59 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.3037 (probability of exploitation in next 30 days)
EPSS percentile: 96.77% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-2859
Assigner: GitHub_M
Published: Jan 16, 2026, 8:10:37 PM
Updated: Jan 16, 2026, 9:15:53 PM
EUVD base score (CVSS 3.1): 9.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 30.3700
Vendors: MCPJam
Products: inspector (≤ 1.4.2)
Aliases: GHSA-232v-j27c-5pp6

ENISA 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.

EUVD references (2)

Affected products (1)

Vendor	Product	Versions	Platforms
MCPJam	inspector	`<= 1.4.2` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:mcpjam:inspector:*:*:*:*:*:*:*:*

Vendor references (2)

References embedded in the original CVE record by the assigning CNA.

https://github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6 x_refsource_CONFIRM
https://github.com/MCPJam/inspector/commit/e6b9cf9d9e6c9cbec31493b1bdca3a1255fe3e7a x_refsource_MISC

MITRE references (2) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://github.com/MCPJam/inspector/commit/e6b9cf9d9e6c9cbec31493b1bdca3a1255fe3e7a x_refsource_MISC
https://github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6 x_refsource_CONFIRM

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/MCPJam/inspector/commit/e6b9cf9d9e6c9cbec31493b1bdca3a1255fe3e7a security-advisories@github.com Patch
https://github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6 security-advisories@github.com ExploitVendor Advisory

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
ipv4	`127.0.0.1`	2026-05-22 03:12 UTC)">malicious	2026-05-21 04:27 UTC
ipv4	`0.0.0.0`	2026-05-31 00:18 UTC)">not flagged	2026-05-21 04:27 UTC

Remediations (12)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Oracle Critical Database Patch ID for April 2026 along with enabled ...

web:dbsguru.com

Below is the list of Oracle Critical Patch IDs for all versions (26i, 21c, 19c) of Grid & Databases, along with combo PSU, EXADATA, and SUPERCLUSTER patch IDs for April 2026 . All patch IDs are enabled using the direct download link.

2026-05-22 19:09 UTC
Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days

web:www.bleepingcomputer.com

Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

2026-05-22 19:09 UTC
Nvd - Cve-2026-23744

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-22 04:41 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-22 04:41 UTC
April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

2026-05-22 04:41 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-22 04:41 UTC
Oracle Patches 450 Vulnerabilities With April 2026 CPU

web:www.securityweek.com

Oracle on Tuesday announced the release of 481 new security patches as part of its April 2026 Critical Patch Update (CPU). Across the 28 product families that received security updates, more than 300 patches address vulnerabilities that are remotely exploitable without authentication.

2026-05-22 04:41 UTC
Oracle April 2026 Critical Patch Update 241 CVEs | Tenable®

web:www.tenable.com

Oracle addresses 241 CVEs in its April Critical Patch Update, the second quarterly update of 2026 with 481 patches, including 34 critical updates.

2026-05-22 04:41 UTC
Windows 11 April 2026 Update tested: What's new, improved and fixed

web:www.windowslatest.com

Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.

2026-05-22 04:41 UTC
Oracle Security Patches April 2026 | Tech News

web:cyberwebspider.com

Oracle has issued a substantial update, releasing 481 security patches as part of its April 2026 Critical Patch Update (CPU). This comprehensive update spans 28 product families and addresses over 300 vulnerabilities that could be exploited remotely without the need for authentication.

2026-05-22 04:41 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-22 04:41 UTC
April 2026 Patch Tuesday | Critical Patches & Deployment Guide

web:layerlogix.com

April 2026 Patch Tuesday drops today. Here's what's critical, what to patch first, and how Houston IT teams should handle deployment — including the Secure Boot certificate deadline reminder.

2026-05-22 04:41 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-23744.json.

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