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 ↗

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

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

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