CVE-2026-62886: .NET Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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-Aug

Released

2026-08-11

Description

Integer overflow or wraparound in .NET allows an unauthorized 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. According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? Exploitation of this vulnerability requires that a user trigger the payload in the application.

Affected Products (11)

Developer Tools

• Microsoft Visual Studio 2026 version 18.8
• .NET 10.0 installed on Windows
• .NET 10.0 installed on Mac OS
• .NET 10.0 installed on Linux
• .NET 8.0 installed on Windows
• .NET 8.0 installed on Linux
• .NET 8.0 installed on Mac OS
• .NET 9.0 installed on Linux
• .NET 9.0 installed on Windows
• .NET 9.0 installed on Mac OS
• Microsoft Visual Studio 2022 version 17.14

Security Updates (3)

• 5122106
• 5122104
• 5122105

Acknowledgments

<a href="https://x.com/ky0tofu">Ky0toFu</a>, 41ae55e9310ff27fa6f26af4727e5590, kai63001, zpbrent

Revision History

• 2026-08-11: Information published.