Description
metatool-ai MetaMCP up to and including 2.4.22 is vulnerable to Code Execution in the internal MCP inspector proxy endpoint GET /mcp-proxy/server/stdio (createTransport, STDIO branch, routers/mcp-proxy/server.ts).
Published: 2026-09-29
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Code Execution
Action: Restrict Access
AI Analysis

Impact

A code injection flaw exists in MetaMCP’s internal inspector proxy endpoint accessed via GET /mcp-proxy/server/stdio. The vulnerability allows an attacker to execute arbitrary code on the host machine, potentially giving full system compromise, unauthorized data disclosure, and service disruption. The weakness is classified as a code injection error.

Affected Systems

MetaMCP versions up to and including 2.4.22 are affected. No information about newer releases is provided, so any instance running these or older releases is at risk.

Risk and Exploitability

The CVSS score of 9.8 indicates critical severity. The EPSS is not available and the flaw is not listed in CISA KEV. The likely attack vector requires remote network access to the internal /mcp-proxy/server/stdio endpoint, possibly requiring valid credentials. Successful exploitation would enable remote code execution on the host and pose a high risk to confidentiality, integrity, and availability.

Generated by OpenCVE AI on September 30, 2026 at 13:53 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply an updated MetaMCP release that addresses the issue as soon as a patched version becomes available.
  • If a patch is not yet released, block or disable the GET /mcp-proxy/server/stdio endpoint by configuring firewall rules or reverse‑proxy restrictions to limit access to trusted administrators.
  • Restrict network connectivity to the MetaMCP instance so that only authorized administrative users can reach the internal inspector proxy endpoint.

Generated by OpenCVE AI on September 30, 2026 at 13:53 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 30 Sep 2026 14:15:00 +0000

Type Values Removed Values Added
Title Code Execution Vulnerability in MetaMCP Inspector Proxy Endpoint

Wed, 30 Sep 2026 05:15:00 +0000

Type Values Removed Values Added
Title Code Execution Vulnerability in MetaMCP Inspector Proxy Endpoint

Tue, 29 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-94
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 29 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
Description metatool-ai MetaMCP up to and including 2.4.22 is vulnerable to Code Execution in the internal MCP inspector proxy endpoint GET /mcp-proxy/server/stdio (createTransport, STDIO branch, routers/mcp-proxy/server.ts).
References

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-29T20:31:12.917Z

Reserved: 2026-08-25T00:00:00.000Z

Link: CVE-2026-79538

cve-icon Vulnrichment

Updated: 2026-09-29T20:31:07.359Z

cve-icon NVD

Status : Deferred

Published: 2026-09-29T20:17:27.510

Modified: 2026-09-29T21:28:02.477

Link: CVE-2026-79538

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T14:00:07Z

Weaknesses
  • CWE-94

    Improper Control of Generation of Code ('Code Injection')