CVE-2026-102870 · GHSA-g27p-qf6j-c96c
Microsoft Security Advisory CVE-2026-102870 - ASP.NET Core Remote Code Execution Vulnerability
- Risk score
- 79/100
- CVSS
- 8.8 v3.1
- Exploit chance (30 days)
- 0.8%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.
- Affected
- Microsoft.AspNetCore.Components.WebAssembly.Server (nuget) >= 10.0.0, <= 10.0.12; Microsoft.AspNetCore.Components.WebAssembly.Server (nuget) >= 11.0.0-preview.1, <= 11.0.0-rc.1
- Fix
- Upgrade Microsoft.AspNetCore.Components.WebAssembly.Server to 10.0.13 or 11.0.0-rc.2.26478.115 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.8 high
- Remotely exploitable without logging in
- On your watchlist: asp.net core, NuGet
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| Microsoft.AspNetCore.Components.WebAssembly.Server | nuget | >= 10.0.0, <= 10.0.12 | 10.0.13 |
| Microsoft.AspNetCore.Components.WebAssembly.Server | nuget | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2.26478.115 |
References
- https://github.com/advisories/GHSA-g27p-qf6j-c96c
- https://github.com/dotnet/aspnetcore/security/advisories/GHSA-g27p-qf6j-c96c
- https://github.com/dotnet/announcements/issues/445
- https://github.com/dotnet/aspnetcore/discussions/69791
- https://nvd.nist.gov/vuln/detail/CVE-2026-102870
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102870
- https://github.com/advisories/GHSA-g27p-qf6j-c96c
Original description
Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.
Last activity 13 Oct 2026. Patch Forecast updates every hour.