---
title: "Microsoft.AspNetCore.Authentication.Negotiate — CVE-2026-70179"
description: "An authentication bypass flaw affects the NuGet package Microsoft.AspNetCore.Authentication.Negotiate. Affected versions: >= 10.0.0, <= 10.0.12. Fixed from version 10.0.13. CVSS score 7.5."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-10-13-cve-2026-70179
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-10-13
dateModified: 2026-10-13
---
# Microsoft.AspNetCore.Authentication.Negotiate — CVE-2026-70179

An authentication bypass flaw affects the NuGet package Microsoft.AspNetCore.Authentication.Negotiate. Affected versions: >= 10.0.0, <= 10.0.12. Fixed from version 10.0.13. CVSS score 7.5.

## What to do

Update Microsoft.AspNetCore.Authentication.Negotiate to 10.0.13 or later.

| Fact | Value |
| --- | --- |
| Package | Microsoft.AspNetCore.Authentication.Negotiate |
| Ecosystem | NuGet (.NET) |
| Class | Authentication bypass |
| Affected versions | >= 10.0.0, <= 10.0.12 |
| Fixed version | 10.0.13 |
| CVSS | 7.5 |
| CVE | CVE-2026-70179 |
| GHSA | GHSA-vrrp-6v32-2p8g |
| Published on | October 13, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-vrrp-6v32-2p8g](https://github.com/advisories/GHSA-vrrp-6v32-2p8g) — GitHub Security Advisories
- [NVD — CVE-2026-70179](https://nvd.nist.gov/vuln/detail/CVE-2026-70179) — NVD

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