CVE-2026-45490: .NET SDK Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

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

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jun

Released

2026-06-09

EPSS Score

0.38% (percentile: 30.9%)

Description

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

FAQ

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected Products (3)

Developer Tools

• .NET 10.0 installed on Windows
• .NET 8.0 installed on Windows
• .NET 9.0 installed on Windows

Security Updates (3)

• 5097148
• 5097149
• 5097150

Acknowledgments

Ky0toFu, 41ae55e9310ff27fa6f26af4727e5590, chupaohong

Revision History

• 2026-06-09: Information published.