MSRC-CVE-2026-114148 — ASP.NET Core Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain the highest privileges on the system.

Security updates
8.0.427 — https://support.microsoft.com/help/5133964
9.0.320 — https://support.microsoft.com/help/5133965
10.0.403 — https://support.microsoft.com/help/5133966
11.0.100-rc.3 — https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc3/11.0.0-rc.3.md

Vulnerabilities 1

High 7.8

CVE-2026-114148 Public exploit

ASP.NET Core Elevation of Privilege Vulnerability

Incorrect default permissions in ASP.NET Core allows an authorized attacker to elevate privileges locally.

Microsoft .NET 11.0 installed on Windows .NET 11.0 installed on Linux .NET 11.0 installed on Mac OS Linux Windows macOS Ubuntu Alpine

Oct 29, 2026

Revision history

2026-10-25 #1
Information published.

References

CVE-2026-114148 ASP.NET Core Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-114148
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss