CVE-2026-111767CWE-639CWE-862broken-access-control

CVE-2026-111767

High · published October 20, 2026

CVSS v3.1
8.6
EPSS
0%
Percentile
26.8
In the wild
Unconfirmed
What it is

MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.24.0 to before version 1.32.0, the experimental tasks feature (taskStore) did not check which session created a task. Clients sharing one InMemoryTaskStore could list, read and cancel each other's tasks. This issue has been patched in version 1.32.0.

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00345 · 26.8th percentile
Weaknesses
CWE-639 · Authorization Bypass Through User-Controlled Key; CWE-862 · Missing Authorization
Published
2026-10-20T23:17Z
References (3)
https://github.com/modelcontextprotocol/typescript-sdk/commit/727075b5bbeb77fbea22041b36b72a73042160fa · [email protected]https://github.com/modelcontextprotocol/typescript-sdk/pull/2925 · [email protected]https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-22jm-h49p-29qw · [email protected]
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 18:28Z
    MCP TypeScript SDK: Experimental tasks were not tied to the session that created them
    cvelistv5
  • 20 OCT 18:28Z
    MCP TypeScript SDK: Experimental tasks were not tied to the session that created them
    cvelistv5