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ExploitedNot in CISA KEV yetFix available

CVE-2026-23744

Exploitation confirmed. First attested on 2026-03-07 by GCVE · kevintel, GCVE · shadowserver.

  • Published2026-01-16
  • Fixed in1.4.3
  • WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-01-1620:15CVE publishedNVD
  2. 2026-03-0700:11Listed as exploited by GCVEGCVE
  3. 2026-03-0700:11Exploitation first reportedGCVE
  4. 2026-07-07Exploit-DB entryExploit-DB

Versions per branch

NVD · OSV
Mcpjam inspector
BranchAffectedFixed in
1.4< 1.4.31.4.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • MCPJam inspector
    Affected
    • = <= 1.4.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-16

Fix

  1. Update Mcpjam inspector to 1.4.3

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-52625
Exploit-DB
Proof of concept
Metasploit modules
1 moduleexploit/multi/http/mcpjam_inspector_rcerank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-01-16
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-232v-j27c-5pp6

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?

A proof-of-concept exploit exists for CVE-2026-23744, but active exploitation has not been confirmed at this time.

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 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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