# CVE-2026-111767: MCP TypeScript SDK missing authorization in experimental tasks

Source: https://junglewise.ai/threats/cve-2026-111767-mcp-typescript-sdk-experimental-tasks-were-not-tied-to-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-111767 · Severity: high · CVSS 8.6 · Published 2026-10-20

The MCP TypeScript SDK's experimental task management feature failed to isolate tasks by user session, allowing one client to view, modify, or cancel another client's tasks when they share the same server instance. This breaks the confidentiality and integrity of task data across concurrent users, exposing business-critical task information and enabling unauthorized task manipulation.

Technologies: [@modelcontextprotocol/sdk (npm)](https://junglewise.ai/threats/technologies/modelcontextprotocol-sdk). Vendors: [Model Context Protocol](https://junglewise.ai/threats/vendors/model-context-protocol), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-111767 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111767 being exploited in the wild.

**How severe is CVE-2026-111767?** High severity, with a CVSS score of 8.6, published 20 October 2026.

**Which products and versions are affected?** Model Context Protocol TypeScript SDK 1.24.0 through 1.31.0; @modelcontextprotocol/sdk (npm) >= 1.24.0, < 1.32.0, SEMVER:introduced=1.24.0,fixed=1.32.0.

**Is there a fix for CVE-2026-111767?** Yes. @modelcontextprotocol/sdk (npm): upgrade to 1.32.0 or later. Until then: Remove the taskStore parameter when instantiating McpServer or Server, or alternatively create a separate InMemoryTaskStore for each client session rather than sharing one store across all sessions. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-111767 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-111767?** Check whether you run Model Context Protocol TypeScript SDK or @modelcontextprotocol/sdk (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @modelcontextprotocol/sdk (npm): upgrade to 1.32.0 or later

  ```sh
  npm install @modelcontextprotocol/sdk@1.32.0
  ```


Remove the taskStore parameter when instantiating McpServer or Server, or alternatively create a separate InMemoryTaskStore for each client session rather than sharing one store across all sessions.

## Technical details

The InMemoryTaskStore component in the SDK lacked session-based authorization checks on task operations (list, read, cancel). An attacker with network access to an affected HTTP server could enumerate and manipulate tasks created by other sessions because all sessions were granted direct access to the shared store. The vulnerability requires the application to explicitly pass taskStore to McpServer; the vulnerability is fixed in version 1.32.0 and later.

## Affected products

- Model Context Protocol TypeScript SDK 1.24.0 through 1.31.0

## Identifiers

- CVE-2026-111767
- GHSA-22jm-h49p-29qw

## Timeline

- 2026-10-20: disclosed

## References

- [https://api.github.com/users/cipher-creator](https://api.github.com/users/cipher-creator)

## Related threats

- [MCP TypeScript client SDK credential leak via cross-origin redirects](https://junglewise.ai/threats/cve-2026-111769-mcp-typescript-client-sdk-http-client-transports-and-oauth)
- [MCP TypeScript SDK memory exhaustion via unbounded validation](https://junglewise.ai/threats/cve-2026-111768-mcp-typescript-sdk-one-http-request-within-the-default-size)
- [MCP TypeScript SDK bearer authentication token validation bypass](https://junglewise.ai/threats/cve-2026-111771-mcp-typescript-sdk-server-bearer-authentication-accepted-tokens)
- [MCP TypeScript SDK denial of service via unbounded request body and JSON-RPC batch](https://junglewise.ai/threats/mcp-typescript-sdk-http-server-transports-and-handlers-did-not-limit-c51dda65)
- [MCP TypeScript SDK OAuth client credential injection via untrusted server](https://junglewise.ai/threats/cve-2026-104850-mcp-typescript-sdk-oauth-client-could-send-credentials-to-an)