CVE-2026-65774: Windows Installer Elevation of Privilege Vulnerability
This Microsoft advisory covers CVE-2026-65774 in Windows Server 2019, Windows Server 2022 and Windows Server 2025.
- CVE-2026-65774
Key facts
- Vendor rating
- High, CVSS 7.8
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9418; Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9115; Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7663 and 9 more below
- Fixed in
- KB5120238 (build 10.0.17763.9121), KB5120242 (build 10.0.20348.5499), KB5120229 (build 10.0.20348.5440) 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
Windows Installer Elevation of Privilege Vulnerability
Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 2 more.
Affected products named by the advisory: Windows Server 2012 R2.
Text from the source record.
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9418
- Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9115
- Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7663
- Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.7663
- Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7517
- Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7517
- Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9168
- Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9168
- Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2704
- Windows Server 2012 6.2.9200.0 before 6.2.9200.26279
- Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.26279
- Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23337
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-65774
Upgrade to a fixed release named by Microsoft:
- KB5120238 (build 10.0.17763.9121)
- KB5120242 (build 10.0.20348.5499)
- KB5120229 (build 10.0.20348.5440)
- KB5120249 (build 10.0.19045.7663)
- KB5120233 (build 10.0.26100.33296)
- KB5120228 (build 10.0.26100.33222)
- KB5121003 (build 10.0.26100.9168)
- KB5120994 (build 10.0.26100.9106)
Vendor guidance
- Install the applicable security update for your platform: KB5120238, KB5120242, KB5120229, KB5120249, KB5120233, KB5120228 (see the Microsoft Update Catalog).
End-of-life dates for Windows Server
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