---
title: "@modelcontextprotocol/sdk — CVE-2026-104850"
description: "An authentication bypass flaw affects the npm package @modelcontextprotocol/sdk. Affected versions: >= 1.12.0, < 1.31.0. Fixed from version 1.31.0. CVSS score 7.5."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-10-06-cve-2026-104850
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-10-06
dateModified: 2026-10-06
---
# @modelcontextprotocol/sdk — CVE-2026-104850

An authentication bypass flaw affects the npm package @modelcontextprotocol/sdk. Affected versions: >= 1.12.0, < 1.31.0. Fixed from version 1.31.0. CVSS score 7.5.

## What to do

Update @modelcontextprotocol/sdk to 1.31.0 or later.

| Fact | Value |
| --- | --- |
| Package | @modelcontextprotocol/sdk |
| Ecosystem | npm (JavaScript) |
| Class | Authentication bypass |
| Affected versions | >= 1.12.0, < 1.31.0 |
| Fixed version | 1.31.0 |
| CVSS | 7.5 |
| CVE | CVE-2026-104850 |
| GHSA | GHSA-6qxp-vccf-f47h |
| Published on | October 6, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-6qxp-vccf-f47h](https://github.com/advisories/GHSA-6qxp-vccf-f47h) — GitHub Security Advisories
- [NVD — CVE-2026-104850](https://nvd.nist.gov/vuln/detail/CVE-2026-104850) — NVD

---

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