CVE-2026-96230 · GHSA-qjpx-jqm5-h2c4
Microsoft Security Advisory CVE-2026-96230 - ASP.NET Core Remote Code Execution Vulnerability
- Risk score
- 80/100
- CVSS
- 8.8 v3.1
- Exploit chance (30 days)
- 0.9%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Improper neutralization of input during web page generation ('cross-site scripting') 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; Microsoft.AspNetCore.Components.WebAssembly.Server (nuget) >= 8.0.0, <= 8.0.31; Microsoft.AspNetCore.Components.WebAssemb…
- Fix
- Upgrade Microsoft.AspNetCore.Components.WebAssembly.Server to 10.0.13 or 11.0.0-rc.2 or 8.0.32 or 9.0.21 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Story map
At a glance
Microsoft.AspNetCore.Components.WebAssembly.Server: Red, act today. A vulnerability in ASP.NET Core allows an attacker to execute code over a network, potentially leading to remote code execution. An attacker could exploit this vulnerability to execute code without requiring authentication.
The flaws
- CVE-2026-96230: Microsoft Security Advisory CVE-2026-96230 - ASP.NET Core Remote Code Execution Vulnerability (CVSS 8.8 · EPSS 1%)
- CVE-2026-102870: Microsoft Security Advisory CVE-2026-102870 - ASP.NET Core Remote Code Execution Vulnerability (CVSS 8.8 · EPSS 1%)
The fix
Fix: Upgrade to version 10.0.13 or 11.0.0-rc.2.26478.115
Who is exposed: {'products': ['ASP.NET Core'], 'packages': [{'ecosystem': 'nuget', 'name': 'Microsoft.AspNetCore.Components.WebAssembly.Server', 'vulnerable': '>= 10.0.0, <= 10.0.12'}, {'ecosystem': 'nuget', 'name': 'Microsoft.AspNetCore.Components.WebAssembly.Server', 'vulnerable': '>= 11.0.0-preview.1, <= 11.0.0-rc.1'}], 'versions'…
Where it stands
- No known exploitation
How it unfolded
- 25 Oct, Microsoft Security Response Center (official): CVE-2026-102870 ASP.NET Core Remote Code Execution Vulnerability
Connects to
- Same weakness: Cross-site scripting (CWE-79). 399 other warnings in 30 days
Why it is Red
- 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 |
| Microsoft.AspNetCore.Components.WebAssembly.Server | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.AspNetCore.Components.WebAssembly.Server | nuget | >= 9.0.0, <= 9.0.20 | 9.0.21 |
References
- https://github.com/advisories/GHSA-qjpx-jqm5-h2c4
- https://github.com/dotnet/aspnetcore/security/advisories/GHSA-qjpx-jqm5-h2c4
- https://github.com/dotnet/announcements/issues/478
- https://github.com/dotnet/aspnetcore/discussions/69802
- https://nvd.nist.gov/vuln/detail/CVE-2026-96230
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96230
- https://github.com/advisories/GHSA-qjpx-jqm5-h2c4
Original description
Improper neutralization of input during web page generation ('cross-site scripting') in ASP.NET Core allows an unauthorized attacker to execute code over a network.
Last activity 13 Oct 2026. Patch Forecast updates every hour.