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Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M

CVE-2026-111767MCP TypeScript SDK: Experimental tasks were not tied to the session that created them

High 8.6

In plain English

A high-severity authorization bypass via user-controlled key in typescript-sdk from modelcontextprotocol. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.3%top 71.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@modelcontextprotocol/sdk1.32.0GHSA-22jm-h49p-29qw

Affected products (as reported)

VendorProductVersions
modelcontextprotocol typescript-sdk >= 1.24.0, < 1.32.0

Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

References