CVE-2026-70183 · GHSA-494h-xx7x-5frh
Microsoft Security Advisory CVE-2026-70183 - ASP.NET Core Security Feature Bypass Vulnerability
- Risk score
- 63/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Concurrent execution using shared resource with improper synchronization ('race condition') in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
- Affected
- Microsoft.AspNetCore.App.Runtime.linux-arm (nuget) >= 8.0.0, <= 8.0.31; Microsoft.AspNetCore.App.Runtime.linux-arm64 (nuget) >= 8.0.0, <= 8.0.31; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (nuget) >= 8.0.0, <= 8.0.31; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (nuget) >= 8.0.0, <= 8.0.31
- Fix
- Upgrade Microsoft.AspNetCore.App.Runtime.linux-arm to 8.0.32; Microsoft.AspNetCore.App.Runtime.linux-arm64 to 8.0.32; Microsoft.AspNetCore.App.Runtime.linux-musl-arm to 8.0.32; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 to 8.0.32; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 to 8.0.32; Mi…
- 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.App.Runtime.linux-arm | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.osx-arm64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.win-arm | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.win-x64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.App.Runtime.win-x86 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
References
- https://github.com/advisories/GHSA-494h-xx7x-5frh
- https://github.com/dotnet/aspnetcore/security/advisories/GHSA-494h-xx7x-5frh
- https://github.com/dotnet/announcements/issues/460
- https://github.com/dotnet/aspnetcore/discussions/69796
- https://nvd.nist.gov/vuln/detail/CVE-2026-70183
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70183
- https://github.com/advisories/GHSA-494h-xx7x-5frh
Original description
Concurrent execution using shared resource with improper synchronization ('race condition') in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Last activity 13 Oct 2026. Patch Forecast updates every hour.