High7.8Microsoft Server

High [CVE-2026-62886] .NET Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-62886 affecting Microsoft .NET Framework 3.5 on Windows Server 2012, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 R2.

CVE-2026-62886 Published Aug 11, 2026

CVE-2026-62886

Affected products & platforms

Microsoft ServerWindows Server

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Summary

.NET Elevation of Privilege Vulnerability

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

Affected products named by the advisory: Microsoft .NET Framework 4.8 on Windows Server 2016; Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019; Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019; Microsoft .NET Framework 3.5 AND 4.8.1 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 2 hours ago·verify at source

Fixed versions

KB5120716 (build 2.0.50727.8984 & 3.0.30729.8980)
KB5126044 (build 4.7.4145.0)
KB5126049 (build 4.8.4806.0)
KB5126051 (build 4.8.4806.0)
KB5126047 (build 4.8.4806.0)
KB5126043 (build 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0)
KB5126048 (build 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4806.0)
KB5126422 (build 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9347.0)

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5120716, KB5126044, KB5126049, KB5126051, KB5126047, KB5126043 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 2 hours 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; accepted detail fields are attributed to this page.
Microsoft Server

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-62886NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5120716
Official documentation
Direct download of the KB5120716 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5126044
Official documentation
Direct download of the KB5126044 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5126049
Official documentation
Direct download of the KB5126049 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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