CVE-2026-23744

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 45.0%, top 1% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 65%
  • Public exploit code is available (Metasploit, ssvc poc, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 65%CVSS: 9.8Exploit: Metasploit · ssvc poc · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
77(Attend)
EG Risk 77/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation45% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
65%
EPSS %ILE
99%
KEV
Not listed

Published

January 16, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

REC in MCPJam inspector due to HTTP Endpoint exposes · Advisory · MCPJam/inspector · GitHub

https://github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6
github_commit

commit e6b9cf9d9e6c (MCPJam/inspector)

Fix landed in MCPJam/inspector commit e6b9cf9d9e6c — awaiting tagged release

https://github.com/MCPJam/inspector/commit/e6b9cf9d9e6c9cbec31493b1bdca3a1255fe3e7a

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@mcpjam/inspector—1.4.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 128 total refreshes for this CVE.

  1. 2026-09-19 18:03 UTCOSV refresh
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-16 14:07 UTCEPSS rescore
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  15. 2026-08-31 21:34 UTCOSV refresh
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  1. 2026-08-17 13:47 UTCEPSS rescore
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  4. 2026-08-14 13:52 UTCEG score recompute
  5. 2026-08-13 22:00 UTCEPSS rescore
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  8. 2026-08-09 19:26 UTCEG score recompute
  9. 2026-08-09 13:46 UTCEPSS rescore
  10. 2026-08-08 00:21 UTCEG score recompute
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  22. 2026-07-23 10:19 UTCOSV refresh
  23. 2026-07-23 03:07 UTCEG score recompute
  24. 2026-07-22 14:08 UTCEPSS rescore
  25. 2026-07-21 15:24 UTCEPSS rescore
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  27. 2026-07-20 17:08 UTCEPSS rescore
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  47. 2026-07-06 16:27 UTCEPSS rescore
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  49. 2026-07-06 05:32 UTCOSV refresh
  50. 2026-07-04 06:31 UTCEPSS rescore
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  52. 2026-07-01 15:06 UTCEPSS rescore
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  65. 2026-06-21 14:56 UTCEPSS rescore
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  67. 2026-06-21 01:59 UTCEPSS rescore
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  69. 2026-06-18 17:52 UTCEPSS rescore
  70. 2026-06-17 17:53 UTCEPSS rescore
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  72. 2026-06-17 16:43 UTCOSV refresh
  73. 2026-06-16 17:52 UTCEPSS rescore
  74. 2026-06-15 17:48 UTCEPSS rescore
  75. 2026-06-14 23:18 UTCEPSS rescore

Publicly available exploits

(10 references)

Working exploit code is in the public domain (1 Metasploit module) (8 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCMluex0/CVE-2026-23744-PoC
    First seen Aug 10, 2026

    CVE-2026-23744 is an unauthenticated command injection in MCPJam Inspector ≤1.4.2 via /api/mcp/connect. This POC exploits it by sending a crafted JSON payload to execute arbitrary commands, granting a reverse shell with PTY.

    Open source ↗
  • GitHub PoCCerberusMrXi/CVE-2026-23744-MCPJam-Exploit
    First seen Jul 14, 2026

    A proof-of-concept exploit for CVE-2026-23744 - MCPJam Inspector Remote Code Execution (RCE) vulnerability. This tool demonstrates the security flaw in versions <=1.4.2 and helps security researchers verify patches. For authorized testing and educational purposes only. Includes multiple payload options, command execution, and session management.

    Open source ↗
  • Exploit-DBEDB-52625
    First seen Jul 7, 2026

    MCPJam Inspector - Remote Code Execution

    Open source ↗
  • GitHub PoCthisisish/HTB-DevHub
    First seen May 31, 2026

    CVE-2026-23744 RCE + Privilege Escalation

    Open source ↗
  • GitHub PoCluiskrnr/exploit-CVE-2026-23744
    First seen Apr 10, 2026

    MCPJam Inspector is a local-first development platform for MCP servers. In versions 1.4.2 (and earlier), a RCE flaw lets attackers send crafted HTTP request that installs an MCP server and runs code remotely, because the service listens on 0.0.0.0 (instead of 127.0.0.1) by default.

    Open source ↗
  • GitHub PoCFrenzisRed/CVE-2026-23744
    First seen Mar 23, 2026

    CVE-2026-23744 - MCPJam inspector Remote-Code-Execution: Proof Of Concept (POC

    Open source ↗
  • GitHub PoCsuljov/CVE-2026-23744-Remote-Code-Execution-POC
    First seen Mar 21, 2026

    MCPJam inspector contains a remote code execution

    Open source ↗
  • GitHub PoCboroeurnprach/CVE-2026-23744-PoC
    First seen Jan 20, 2026

    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.

    Open source ↗
  • GitHub PoCibreakthingsforaliving/CVE-2026-23744-PoC
    First seen Jan 20, 2026

    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.

    Open source ↗
  • Metasploitexploit/multi/http/mcpjam_inspector_rce✓ verified
    First seen Jan 16, 2026

    MCPJam Inspector Connect API Command Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-23744?
CVE-2026-23744 is a critical vulnerability published on January 16, 2026. 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…
When was CVE-2026-23744 disclosed?
CVE-2026-23744 was first published in the National Vulnerability Database on January 16, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23744 actively exploited?
CVE-2026-23744 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 65% probability of exploitation in the next 30 days, which ranks it in the top 0.8% of all scored CVEs.
What is the CVSS score of CVE-2026-23744?
CVE-2026-23744 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-23744?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23744, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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