CVE-2026-47303 ASP.NET Core Elevation of Privilege Vulnerability
An authentication bypass in ASP.NET Core allows authorized attackers to elevate privileges over the network, requiring immediate patching.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47303?
CVE-2026-47303 is a high-severity authentication bypass vulnerability in Microsoft .Net, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Which versions are affected by CVE-2026-47303?
8 open source packages ship an affected version, including Microsoft.AspNetCore.Authentication.Negotiate, dotnet and dotnet-sdk. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 10.0.0 | 10.0.10 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 10.0.0 | 10.0.10 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 8.0.0 | 8.0.29 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 8.0.0 | 8.0.29 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 9.0.0 | 9.0.18 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 9.0.0 | 9.0.18 |
2 more packages
dotnet Bitnami | From 8.0.0 | 8.0.29, 9.0.18, 10.0.6 |
dotnet-sdk Bitnami | From 8.0.0 | 8.0.29, 9.0.18, 10.0.6 |
Products include Microsoft .Net, Microsoft Visual Studio 2022, Microsoft Visual Studio 2026.
How do I fix CVE-2026-47303?
Upgrade Microsoft.AspNetCore.Authentication.Negotiate to a fixed version for your release line: 10.0.10, 8.0.29 or 9.0.18.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-47303 being exploited?
There is no known exploitation of CVE-2026-47303 in the wild and no public exploit code.
Other vulnerabilities in Microsoft .Net
- CVE-2024-43498 .NET and Visual Studio Remote Code Execution Vulnerability
- CVE-2024-0057 NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability
- CVE-2026-96957 .NET Security Feature Bypass Vulnerability
- CVE-2026-69439 .NET and Visual Studio Elevation of Privilege Vulnerability
- CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability
Sources
Also known as BIT-dotnet-2026-47303, BIT-dotnet-sdk-2026-47303, GHSA-2p3q-h3hg-jcqq, MINI-7v57-w296-3fc7, MINI-r7xw-m2c8-jghp, UBUNTU-CVE-2026-47303.