ASP.NET Core Remote Code Execution Vulnerability

Source data

Overview

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.

Impact & technical details

Remote Code Execution

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.

CVSS base score

8.8 / 10

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

Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.

Affected products

• Microsoft Visual Studio 2022 version 17.14
• Microsoft Visual Studio 2026 version 18.10
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 runtime installed on Linux
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 runtime installed on Mac OS
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 runtime installed on Windows
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 runtime installed on Linux
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 runtime installed on Mac OS
• Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 runtime installed on Windows

Source guidance

Remediation

• Release Notes

At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.

Authoritative sources & updates

Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.

• Microsoft Security Response Center (opens in a new tab)
• Microsoft security update · Release Notes (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · Release Notes (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)