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CVE-2026-69806

.NET Elevation of Privilege Vulnerability

Published: Sep 8, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-94
7.0HIGH
NVD MITRE
EPSS Score
1.8%
Top 22.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

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

In plain language

AI Act now

CVE-2026-69806 is a .NET weakness that can let a local attacker increase their permissions on a machine running affected .NET or Visual Studio; small businesses should patch because it can turn a limited foothold into full control of that machine.

Executive summary

In .NET, CVE-2026-69806 is an elevation-of-privilege issue that can be triggered by a local attacker to gain higher permissions on the affected system (CWE-94/CWE-200).

If affected, business impact
Full control of the affected machineSensitive data exposure on-hostService disruption from takeoverCompromise of developer environments

What to do now

  1. Check which versions of .NET you have installed (/.NET 9.0, 10.0, or 11.0), and whether those versions are below the fixed builds listed below.
  2. Check whether Microsoft Visual Studio 2022 version 17.14 is installed and confirm whether it’s below 17.14.40.
  3. Check whether Microsoft Visual Studio 2026 version 18.9 is installed and confirm whether it’s below 18.9.3.
  4. Upgrade .NET to a fixed version: .NET 10.0 to 10.0.111 or 10.0.400; .NET 11.0 to the RC1 fixed build; .NET 9.0 to 9.0.317.
  5. Upgrade Visual Studio: Visual Studio 2022 version 17.14 to 17.14.40; Visual Studio 2026 version 18.9 to 18.9.3.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-94CWE-200

Affected Products

Microsoft
commercial·US
.NET 10.0On-prem
Operating Systems / windows
.NET 11.0On-prem
Operating Systems / windows
.NET 9.0MixedLibrary
OSS Libraries / generic-library
Microsoft Visual Studio 2022 version 17.14On-premDev Tool
DevTools & CI / ide-editor
Microsoft Visual Studio 2026 version 18.9On-prem
Operating Systems / windows

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
Is your org exposed to CVE-2026-69806?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

3 techniques
Collection
Execution
Initial Access
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69806
msrc.microsoft.com
News mentions
1

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