Microsoft Security Response CenterCVE-2026-69806

.NET Elevation of Privilege Vulnerability

HighVendor CVSS 7.0 / 10 1 CVE Published Sep 8, 2026 at 7:00 AM UTC

Summary

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

Release Notes Install KB5126105. Install KB5126106.

Update history

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

Oct 27, 2026 at 9:40 PM UTC
- Added affected products: .NET 9.0 runtime installed on Linux, .NET 10.0 runtime installed on Linux, .NET 11.0 runtime installed on Linux.
- Removed affected products: .NET 9.0 installed on Linux, .NET 10.0 installed on Linux, .NET 11.0 installed on Linux.
Sep 27, 2026 at 11:11 PM UTC
- Added fixed versions: 9.0.20, 10.0.12.
- Removed fixed versions: 9.0.317, 10.0.111, 10.0.400.

Sep 8, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 8, 2026 at 7:15 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Sep 25, 2026 at 7:00 AM UTC
Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
Oct 28, 2026 at 3:45 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

Official bulletin How SecurityAlert builds this record

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