CVE-2026-47300 ASP.NET Core Elevation of Privilege Vulnerability
An authorized attacker can elevate privileges over the network due to an incorrect authentication algorithm implementation in ASP.NET Core.
- 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-2026-47300?
CVE-2026-47300 is a high-severity 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
Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-303
Which versions are affected by CVE-2026-47300?
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-2026-47300?
Upgrade Microsoft.AspNetCore.Authentication.Negotiate to a fixed version for your release line: 10.0.10, 8.0.29 or 9.0.18.
Is CVE-2026-47300 being exploited?
There is no known exploitation of CVE-2026-47300 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-2026-47300, BIT-dotnet-sdk-2026-47300, GHSA-8prm-248r-h957, MINI-85g3-wq47-p9v7, MINI-g587-frv6-h39h, UBUNTU-CVE-2026-47300.