CVE-2026-102870: Microsoft Microsoft.aspnetcore.components.webassembly.server

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.

Affected products

• Microsoft Microsoft.aspnetcore.components.webassembly.server: from 10.0.0, before 10.0.13 (fixed in 10.0.13)
• Microsoft Microsoft Visual Studio 2022 Version 17.14: from 17.14.0, before 17.14.42 (fixed in 17.14.42)
• Microsoft Microsoft Visual Studio 2026 Version 18.10: from 18.10.0, before 18.10.4 (fixed in 18.10.4)

Affected packages

• Microsoft.AspNetCore.Components.WebAssembly.Server (NuGet)

Published 2026-10-13. Last modified 2026-10-14.