CVE-2026-23744: MCPJam inspector is the local-first development platform for MCP servers

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-23744 is a critical-severity flaw (CVSS 9.8) affecting inspector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	67.5% (top 1%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: mcpjam

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-16 20:15 UTCPublished CVE record published
2026-06-17 10:22 UTCUpdated Record last modified

mcpjam inspector UPGRADE

Affected: < 1.4.3

Fixed in: 1.4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy inspector || rpm -q inspector || inspector --version

2. UPGRADE to 1.4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade inspector

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade inspector

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

npm · @mcpjam/inspector · FIXED · 1.4.3 · vulnerable: <= 1.4.2 · source

npm install @mcpjam/inspector@">=1.4.3" npm ls @mcpjam/inspector

Fedora 46 · jgmenu · FIXED · 4.7.0-1.fc46 · FEDORA-2026-3053ee4399 · source

sudo dnf upgrade --advisory=FEDORA-2026-3053ee4399

Fedora ELN · python-tkrzw · FIXED · 0.1.32-12.eln159 · FEDORA-2026-0161d71544 · source

sudo dnf upgrade --advisory=FEDORA-2026-0161d71544

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: boroeurnprach/CVE-2026-23744-PoC (12 stars)
GitHub PoC: suljov/CVE-2026-23744-Remote-Code-Execution-POC (12 stars)
GitHub PoC: CerberusMrXi/CVE-2026-23744-MCPJam-Exploit (7 stars)
Write-up: github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6
Exploit-DB: MCPJam Inspector - Remote Code Execution
Metasploit: MCPJam Inspector Connect API Command Execution
Nuclei scan template: MCPJam Inspector - Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23744?

inspector: upgrade to 1.4.3. Exact commands for each OS are on this page.

Is CVE-2026-23744 being exploited?

CVE-2026-23744 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23744 affect?

CVE-2026-23744 affects inspector. Severity is critical (CVSS 9.8). 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 inst

How urgent is CVE-2026-23744?

Priority 72/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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