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VulnerabilityPublished

CVE-2026-23744: MCPJam inspector · Missing Authentication

Affects MCPJam inspectorSource CVE Database V5

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Public exploit available (Metasploit, Exploit-DB) · 67% EPSS · CVSS 9.8 Critical · fixed in 1.4.3 : patch MCPJam inspector as a priority.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
67.5% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.4.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 16 Jan 2026

  2. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  3. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by GitHub, Inc.

    , 28 hours before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. In Threat Radar

    record ingested

    , 11 minutes after disclosure

  4. First Exploit-DB entry (opens in a new tab)

    MCPJam Inspector - Remote Code Execution

    , 172 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
MCPJaminspectorAffected
  • <=1.4.2
Fixed in–
GitHubmcpjam/inspectorpkg:github/mcpjam/inspectorOther threatsAffected
  • <=1.4.2
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

  1. Immediately upgrade MCPJam inspector to version 1.4.3 or later, which contains the patch for this vulnerability.
  2. If upgrading is not immediately possible, restrict network exposure by configuring the MCPJam inspector service to listen only on localhost (127.0.0.1) or use firewall rules to block external access to the service port.
  3. Implement network segmentation to isolate development environments running MCPJam inspector from untrusted networks.
  4. Monitor network traffic for unusual HTTP requests targeting the MCPJam inspector service.
  5. Employ host-based intrusion detection systems (HIDS) to detect anomalous process creation or installation activities related to MCP servers.
  6. Educate development teams about the risks of running vulnerable versions and the importance of timely patching.
  7. Review and harden default configurations to ensure critical functions require authentication or proper access controls.
  8. Maintain an inventory of MCPJam inspector deployments to ensure all instances are identified and remediated.

Description

CVE-2026-23744 is a critical remote code execution vulnerability in MCPJam inspector versions 1.4.2 and earlier. The flaw arises because the application listens on all network interfaces (0.0.0.0) by default and lacks authentication for a critical function that installs an MCP server. An attacker can exploit this by sending a crafted HTTP request remotely, triggering server installation and arbitrary code execution without any user interaction or privileges. The vulnerability has a CVSS score of 9.8, indicating a severe risk to confidentiality, integrity, and availability.

References

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