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Microsoft Security Response CenterCVE-2026-62886

.NET Elevation of Privilege Vulnerability

HighVendor CVSS 7.8 / 10 1 CVE Published Aug 11, 2026 at 7:00 AM UTC
Get alerts for Microsoft .NET Framework 3.5 on Windows Server

Summary

Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.

Products covered

  • 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

  • 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

Show 44 more products

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems

  • Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems

  • Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems

  • Microsoft .NET Framework 3.5 on Windows Server 2012 R2

  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2

  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025

  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems

  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems

  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems

  • Microsoft Visual Studio 2026 version 18.8

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2

Remediation

Install KB5127660. Install KB5126044. Install KB5126049. Install KB5126051. Install KB5126047. Install KB5127666. Install KB5127685. Install KB5127693. Install KB5126043. Install KB5120703. Install KB5126046. Install KB5126421. Install KB5126052. Install KB5120747. Install KB5126053. Install KB5127664. Install KB5126045. Install KB5126868. Install KB5127687. Install KB5127690. Install KB5123099. Install KB5126424. Install KB5127689. Install KB5127692.

Install KB5127694.

Vendor-listed fixes

  • 2.0.50727.8987 AND 3.0.30729.8982

  • 4.7.4145.0

  • 4.8.4806.0

  • 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0

  • 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0

  • 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0

  • 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0

  • 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0

Show 10 more fixes

  • 2.0.50727.9183 & 3.0.30729.9169 & 4.8.4806.0

  • 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9346.0

  • 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9347.0

  • 2.0.50727.9183 & 3.0.30729.9169

  • 4.8.9347.0

  • 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0

  • 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0

  • 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4145.0

  • 18.8.3

  • 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0

CVEs in this advisory 1

CVE-2026-62886
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Added affected products: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2, Microsoft .NET....
    • Removed affected products: .NET 8.0 installed on Windows, .NET 9.0 installed on Windows, .NET 10.0 installed on Windows, Microsoft Visual Studio 2022 version 17.14.
    • Added fixed versions: 2.0.50727.8987 AND 3.0.30729.8982, 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0, 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0, 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0, 2.0.50727.9073 AND 3.0.30729.9070 AND....
    • Removed fixed versions: 2.0.50727.8984 & 3.0.30729.8980, 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4806.0, 3.0.50727.8984, 8.0.30, 9.0.19.
    • The vendor changed its remediation guidance.
    • Added affected products: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems, Microsoft....
    • Added fixed versions: 2.0.50727.8984 & 3.0.30729.8980, 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4145.0, 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0, 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4806.0, 2.0.50727.9183 & 3.0.30729.9169.
    • The vendor changed its remediation guidance.
    • The vendor changed its remediation guidance.

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

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