MSRC-CVE-2026-45490 — .NET SDK 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 SYSTEM privileges.

Security updates
10.0.9 — https://support.microsoft.com/help/5097148
8.0.28 — https://support.microsoft.com/help/5097149
9.0.17 — https://support.microsoft.com/help/5097150

Vulnerabilities 1

High 7.8

CVE-2026-45490

.NET SDK Elevation of Privilege Vulnerability

Improper authorization in .NET allows an authorized attacker to elevate privileges locally.

Microsoft .NET 9.0 runtime .NET 8.0 runtime .NET 10.0 runtime Ubuntu Alpine

Jun 9, 2026

Revision history

2026-06-09 #1
Information published.

References

CVE-2026-45490 .NET SDK Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45490
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