CVE-2026-70179 ASP.NET Core Elevation of Privilege Vulnerability
An authentication bypass in ASP.NET Core allows authorized attackers to elevate privileges over the network via spoofing.
- 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-2026-70179?
CVE-2026-70179 is a high-severity authentication bypass vulnerability in Microsoft Visual Studio 2022 version 17.14, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-290
Which versions are affected by CVE-2026-70179?
6 open source packages ship an affected version, including Microsoft.AspNetCore.Authentication.Negotiate.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 10.0.0 | 10.0.13 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 10.0.0 | 10.0.13 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 8.0.0 | 8.0.32 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 8.0.0 | 8.0.32 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 9.0.0 | 9.0.21 |
Microsoft.AspNetCore.Authentication.Negotiate NuGet | From 9.0.0 | 9.0.21 |
How do I fix CVE-2026-70179?
Upgrade Microsoft.AspNetCore.Authentication.Negotiate to a fixed version for your release line: 10.0.13, 8.0.32 or 9.0.21.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-70179 being exploited?
There is no known exploitation of CVE-2026-70179 in the wild and no public exploit code.
Sources
Also known as GHSA-vrrp-6v32-2p8g, UBUNTU-CVE-2026-70179.