---
title: "CVE-2026-79537: metatool-ai MetaMCP - Broken Access Control"
description: "metatool-ai MetaMCP through 2.4.22 contains an insecure direct object reference caused by improper session ID validation in MCP transport session dispatch, letting attackers access and execute other tenants' private MCP tools, exploit requires attacker to obtain another tenant's session ID."
url: https://panop.io/threat-heartbeat/CVE-2026-79537/
---

# CVE-2026-79537 metatool-ai MetaMCP - Broken Access Control

metatool-ai MetaMCP through 2.4.22 contains an insecure direct object reference caused by improper session ID validation in MCP transport session dispatch, letting attackers access and execute other tenants' private MCP tools, exploit requires attacker to obtain another tenant's session ID.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.31% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-79537)

## Details

Type

Broken Access Control

Impact

Information Disclosure, Remote Code Execution

CVSS vector

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

Published

29 September 2026

Updated

15 October 2026

Weakness

[CWE-639](https://cwe.mitre.org/data/definitions/639.html)

## Vendor fix

Update to the latest version that properly validates session ownership and binding.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-79537](https://nvd.nist.gov/vuln/detail/CVE-2026-79537)
- [https://github.com/metatool-ai/metamcp](https://github.com/metatool-ai/metamcp)
- [https://www.traceforce.ai/security-advisories/cve-2026-79537](https://www.traceforce.ai/security-advisories/cve-2026-79537)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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