CVE-2026-70165: .NET Elevation of Privilege Vulnerability

Overview

Severity
Medium (CVSS 6.7)
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/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-Oct
Released
2026-10-13

Description

Improper link resolution before file access ('link following') 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 the privileges of the user account or service account running the affected process. According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition and also to take additional actions prior to exploitation to prepare the target environment.

Affected Products (5)

Developer Tools

  • Microsoft Visual Studio 2026 version 18.10
  • Microsoft Visual Studio 2022 version 17.14
  • .NET 9.0 installed on Windows
  • .NET 10.0 installed on Windows
  • .NET 11.0 installed on Windows

Security Updates (3)

Acknowledgments

thegoldmandm, <a href="https://x.com/m4x_1997">Aobo Wang</a>, <a href="https://x.com/omarkhalil1138">Omar Khaleel</a>

Revision History

  • 2026-10-13: Information published.