CVE-2026-69806: .NET Elevation of Privilege Vulnerability

Overview

Severity
High (CVSS 7)
CVSS Vector
CVSS:3.1/AV:L/AC:H/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-Sep
Released
2026-09-08

Description

Exposure of sensitive information to an unauthorized actor in .NET allows an authorized attacker to elevate privileges locally.

FAQ

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation requires a Linux environment where users share a process identifier namespace and process information is exposed to other local users through the proc filesystem. 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.

Affected Products (5)

Developer Tools

  • Microsoft Visual Studio 2026 version 18.9
  • Microsoft Visual Studio 2022 version 17.14
  • .NET 9.0 installed on Linux
  • .NET 10.0 installed on Linux
  • .NET 11.0 installed on Linux

Security Updates (5)

Acknowledgments

<a href="https://x.com/ky0tofu">Ky0toFu</a>, <a href="https://www.linkedin.com/in/rajeshchada/">Rajesh Chada</a> with Microsoft

Revision History

  • 2026-09-08: Information published.