CVE-2026-96230: 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 neutralization of input during web page generation ('cross-site scripting') 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 host a specially crafted web page and convince a developer to visit it. The page could send requests to a vulnerable development server running on the developer's system, and successful exploitation could allow the attacker to execute code in the developer's context. User interaction is required.

Affected Products (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
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 8.0 installed on Windows
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 8.0 installed on Linux
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 8.0 installed on Mac OS
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 9.0 installed on Windows
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 9.0 installed on Linux
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 9.0 installed on Mac OS

Developer Tools

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

Security Updates (1)

• Release Notes

Acknowledgments

<a href="https://x.com/kookiz/">Kevin Gosse</a>

Revision History

• 2026-10-13: Information published.