---
id: CVE-2026-47303
title: ASP.NET Core Elevation of Privilege Vulnerability
summary: >-
  Authentication bypass by assumed-immutable data in ASP.NET Core allows an
  authorized attacker to elevate privileges over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-302
  - CWE-863
  - CWE-90
vendor: Microsoft
product: .NET 10.0
affected:
  - .net_10.0 >= 10.0.0 < 10.0.10
  - .net_8.0 >= 8.0.0 < 8.0.29
  - .net_9.0 >= 9.0.0 < 9.0.18
  - visual_studio_2022_version_17.12 >= 17.12.0 < 17.12.22
  - visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.36
  - visual_studio_2026_version_18.7 >= 18.0 < 18.7.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-13T00:00:00+00:00'
published: '2026-07-14'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T22:28:32.513Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-47303'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303'
    label: ASP.NET Core Elevation of Privilege Vulnerability
  - url: >-
      https://github.com/dotnet/aspnetcore/security/advisories/GHSA-2p3q-h3hg-jcqq
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47303'
  - url: 'https://github.com/dotnet/announcements/issues/411'
  - url: 'https://github.com/dotnet/aspnetcore/discussions/67786'
  - url: 'https://github.com/advisories/GHSA-2p3q-h3hg-jcqq'
tags:
  - cve.org
  - ghsa
  - nuget
epss: 0.00736
epssPercentile: 0.52996
aliases:
  - GHSA-2p3q-h3hg-jcqq
ecosystem: nuget
patched:
  - Microsoft.AspNetCore.Authentication.Negotiate 10.0.10
  - Microsoft.AspNetCore.Authentication.Negotiate 9.0.18
  - Microsoft.AspNetCore.Authentication.Negotiate 8.0.29
ingestedAt: '2026-07-21T16:51:41.837Z'
---

## Overview

Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

## Affected

- `.net_10.0 >= 10.0.0 < 10.0.10`
- `.net_8.0 >= 8.0.0 < 8.0.29`
- `.net_9.0 >= 9.0.0 < 9.0.18`
- `visual_studio_2022_version_17.12 >= 17.12.0 < 17.12.22`
- `visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.36`
- `visual_studio_2026_version_18.7 >= 18.0 < 18.7.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-47303)

Affected packages:

- `Microsoft.AspNetCore.Authentication.Negotiate >= 10.0.0, <= 10.0.9`
- `Microsoft.AspNetCore.Authentication.Negotiate >= 9.0.0, <= 9.0.17`
- `Microsoft.AspNetCore.Authentication.Negotiate >= 8.0.0, <= 8.0.28`

Patched in:

- `Microsoft.AspNetCore.Authentication.Negotiate 10.0.10`
- `Microsoft.AspNetCore.Authentication.Negotiate 9.0.18`
- `Microsoft.AspNetCore.Authentication.Negotiate 8.0.29`

Source: https://github.com/advisories/GHSA-2p3q-h3hg-jcqq