KB5101009: CVEs fixed (Windows update (KB))

KB5101009 fixes 1 tracked CVE. Affected systems and fixed versions.

• CVE-2026-50646 HIGH 7.8 DOWNGRADE UPGRADE Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.

Applies to

• Microsoft .NET Framework 4.8 on Windows Server 2012 · fixed in 4.8.4803.0
• Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) · fixed in 4.8.4803.0

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