CVE-2026-70179 ยท GHSA-vrrp-6v32-2p8g
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
- Risk score
- 64/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.6%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
- Affected
- Microsoft.AspNetCore.Authentication.Negotiate (nuget) >= 10.0.0, <= 10.0.12; Microsoft.AspNetCore.Authentication.Negotiate (nuget) >= 8.0.0, <= 8.0.31; Microsoft.AspNetCore.Authentication.Negotiate (nuget) >= 9.0.0, <= 9.0.20
- Fix
- Upgrade Microsoft.AspNetCore.Authentication.Negotiate to 10.0.13 or 8.0.32 or 9.0.21 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 7.5 high
- On your watchlist: asp.net core, NuGet
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| Microsoft.AspNetCore.Authentication.Negotiate | nuget | >= 10.0.0, <= 10.0.12 | 10.0.13 |
| Microsoft.AspNetCore.Authentication.Negotiate | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.Authentication.Negotiate | nuget | >= 9.0.0, <= 9.0.20 | 9.0.21 |
References
- https://github.com/advisories/GHSA-vrrp-6v32-2p8g
- https://github.com/dotnet/aspnetcore/security/advisories/GHSA-vrrp-6v32-2p8g
- https://github.com/dotnet/announcements/issues/458
- https://github.com/dotnet/aspnetcore/discussions/69794
- https://nvd.nist.gov/vuln/detail/CVE-2026-70179
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70179
- https://github.com/advisories/GHSA-vrrp-6v32-2p8g
Original description
Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Last activity 13 Oct 2026. Patch Forecast updates every hour.