CVE-2026-111767 MCP TypeScript SDK - Broken Access Control

MCP TypeScript SDK 1.24.0 to < 1.32.0 contains a broken access control vulnerability caused by lack of session verification in the experimental taskStore feature, letting clients sharing InMemoryTaskStore access and manipulate each other's tasks, exploit requires shared InMemoryTaskStore usage.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Published
20 October 2026
Updated
21 October 2026
Weakness
CWE-639

Vendor fix

Update to version 1.32.0 or later.

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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