High7.8Microsoft Server

High [CVE-2026-50646] .NET Framework Remote Code Execution Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-50646 affecting Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2.

CVE-2026-50646 Published Jul 14, 2026

CVE-2026-50646

Affected products & platforms

Microsoft ServerWindows Server

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Summary

.NET Framework Remote Code Execution Vulnerability

Affected products named by the advisory: Microsoft.NET Framework 4.8 on Windows Server 2012; Microsoft.NET Framework 4.8 on Windows Server 2016; Microsoft.NET Framework 3.5 AND 4.7.2 on Windows Server 2016; Microsoft.NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2; and 4 more.

Affected products named by the advisory: Microsoft .NET Framework 4.8 on Windows Server 2012 R2; Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019; Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions

KB5101009 (build 4.8.4803.0)
KB5101007 (build 4.8.4803.0)
KB5101008 (build 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0)
KB5101006 (build 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0)
KB5099535 (build 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0)
KB5100991 (build 4.7.4143.0)
KB5100990 (build 4.7.4143.0)
KB5101000 (build 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0)

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5101009, KB5101007, KB5101008, KB5101006, KB5099535, KB5100991 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Microsoft Security Update Guide (MSRC)official
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://api.msrc.microsoft.com/cvrf/v3.0/updates; this link opens the Microsoft Server advisory index instead of the raw feed document.
Microsoft Server
Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Microsoft Server

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-50646NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5101009
Official documentation
Direct download of the KB5101009 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5101007
Official documentation
Direct download of the KB5101007 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5101008
Official documentation
Direct download of the KB5101008 security update named in the MSRC remediation data for this CVE.
MSRC Security Update Guide
Official documentation
Filter by this CVE for per-product KB numbers, severity and exploitability assessment.

Discussion(0)

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