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Microsoft Security Response CenterCVE-2026-45491

.NET Tampering Vulnerability

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

Read the vendor bulletin Get alerts for NET 10.0 installed on Windows
6.2CVSS out of 10High severity
Scope

What the vendor says is affected

  • .NET 10.0 installed on Windows
  • .NET 10.0 installed on Mac OS
  • .NET 10.0 installed on Linux
  • .NET 8.0
  • .NET 8.0 installed on Windows
  • .NET 8.0 installed on Linux
  • .NET 8.0 installed on Mac OS
  • .NET 9.0 installed on Linux
  • .NET 9.0 installed on Mac OS
  • .NET 9.0 installed on Windows

Versions the vendor lists as fixed

  • 10.0.9
  • 8.0.28
  • 9.0.17
Next step

What the vendor recommends

Install KB5097148. Install KB5097149. Install KB5097150.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-45491View CVSS, KEV, EPSS, and threat context
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