CVE-2026-102870: ASP.NET Core Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Oct

Released

2026-10-13

Description

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

FAQ

How could an attacker exploit this vulnerability? An unauthenticated attacker could supply specially crafted data to an application being debugged. If a developer evaluates an affected object during a Blazor WebAssembly debugging session, successful exploitation could allow the attacker to execute code in the developer's context. User interaction is required.

Affected Products (8)

Developer Tools

• Microsoft Visual Studio 2026 version 18.10
• Microsoft Visual Studio 2022 version 17.14

Other

• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Windows
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Linux
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Mac OS
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Windows
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Linux
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Mac OS

Security Updates (1)

• Release Notes

Acknowledgments

alittleston3

Revision History

• 2026-10-13: Information published.