Microsoft Security Response CenterCVE-2026-45491

.NET Tampering Vulnerability

HighVendor CVSS 6.2 / 10 1 CVE Published Jun 9, 2026 at 7:00 AM UTC

Summary

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

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Install KB5097148. Install KB5097149. Install KB5097150.

Update history

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Nov 11, 2026 at 2:20 AM UTC
- Added affected products: .NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS.
- Removed affected products: .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows, .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS.

Jun 9, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 28, 2026 at 11:20 AM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Nov 11, 2026 at 2:20 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

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