high8.8
CVE-2026-47300
Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Impact
Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | .Net | from 8.0.0 before 8.0.29 from 9.0.0 before 9.0.18 from 10.0.0 before 10.0.6 |
| Microsoft | Visual Studio 2022 | from 17.12.0 before 17.12.22 from 17.14.0 before 17.14.36 |
| Microsoft | Visual Studio 2026 | from 18.7.0 before 18.7.4 |
| Microsoft | .NET 10.0 Runtime | from 10.0.0 before 10.0.10 |
| Microsoft | .NET 8.0 Runtime | from 8.0.0 before 8.0.29 |
| Microsoft | .NET 9.0 Runtime | from 9.0.0 before 9.0.18 |
| Microsoft | Microsoft Visual Studio 2022 Version 17.12 | from 17.12.0 before 17.12.22 |
| Microsoft | Microsoft Visual Studio 2022 Version 17.14 | from 17.14.0 before 17.14.36 |
| Microsoft | Microsoft Visual Studio 2026 Version 18.7 | from 18.0 before 18.7.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-8prm-248r-h957
- https://github.com/dotnet/aspnetcore/security/advisories/GHSA-8prm-248r-h957
- https://nvd.nist.gov/vuln/detail/CVE-2026-47300
- https://github.com/dotnet/announcements/issues/409
- https://github.com/dotnet/aspnetcore/discussions/67785
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47300