MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server

Date Oct 6, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product npm · @modelcontextprotocol/sdk

CVE CVE-2026-104850

High-risk advisory CVE-2026-104850

Summary

MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server

Why it matters

GitHub has published a reviewed security advisory for @modelcontextprotocol/sdk. Prioritize it with other application dependency updates.

Operator check

Check whether @modelcontextprotocol/sdk is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-6qxp-vccf-f47h NVD — CVE-2026-104850 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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