CVE-2026-62886: .NET Elevation of Privilege Vulnerability
This Microsoft advisory covers CVE-2026-62886 in 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 and Microsoft .NET Framework 4.8 on Windows Server 2012 R2.
- CVE-2026-62886
Key facts
- Vendor rating
- High, CVSS 7.8
- CISA KEV
- Not listed (catalogue checked )
- Fixed in
- KB5120716 (build 2.0.50727.8984 & 3.0.30729.8980), KB5126044 (build 4.7.4145.0), KB5126049 (build 4.8.4806.0) and 5 more below
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
.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.
Text from the source record.
How to fix CVE-2026-62886
Upgrade to a fixed release named by Microsoft:
- 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)
Vendor guidance
- Install the applicable security update for your platform: KB5120716, KB5126044, KB5126049, KB5126051, KB5126047, KB5126043 (see the Microsoft Update Catalog).
End-of-life dates for Windows Server
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Microsoft Server advisories, August 2026All Microsoft Server advisories
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