CVE-2026-104850: MCP TypeScript SDK

The National Vulnerability Database (NVD) record says that starting in version 1.12.0 and prior to versions 1.31.0 and 2.2.0, the software development kit's OAuth client support let the Model Context Protocol (MCP) server a client connected to decide which authorization server received the client's OAuth credentials.

The record

Kind

Vulnerability

Source record

CVE-2026-104850: MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. Starting in (National Vulnerability Database record)

Record published

2026-10-06

Posted here

2026-10-12

World

Software agents · Enterprise work agents

Controls concerned

Authority binding C-A2; Actor identity verification C-A1

Checked

Checked against its record on 2026-10-22 by a reader who did not draft it; report verification/reports/SIG-2026-10-12-007-2026-10-22.md.

A signal's controls are the ones its record points at, the exposure; a case's controls are the ones its records show were absent or failed, so the two can differ.

Corrections

Changes to what this signal says, with the reason. Every earlier version is kept.

• 2026-10-22: Summary. Found in an independent read against the record on 22 October 2026: the record's claim was stated in the Register's own voice; it is now attributed to the record, with abbreviations spelled out (CVE record CVE-2026-104850).
  Show the change

  Before: Starting in version 1.12.0 and prior to versions 1.31.0 and 2.2.0, the SDK's OAuth client support let the MCP server a client connected to decide which authorization server received the client's OAuth credentials.

  After: The National Vulnerability Database (NVD) record says that starting in version 1.12.0 and prior to versions 1.31.0 and 2.2.0, the software development kit's OAuth client support let the Model Context Protocol (MCP) server a client connected to decide which authorization server received the client's OAuth credentials.

What a signal is. A signal records what a primary record says; it assigns no fault. It is lighter than a case: one dated item from one record, tagged with the world, sector and controls it touches. It becomes a case when it meets the bar for one.

Newer: NHTSA Safety Research Portfolio Public Meeting: Fall 2026, and Automated Driving Systems Workshop
Older: CVE-2026-105740: Langflow