CVE-2026-105545: Windows Installer Elevation of Privilege Vulnerability

Published Nov 10, 2026
·
Updated

An elevation of privilege vulnerability exists in the Windows Installer when the Windows Installer fails to properly sanitize input leading to an insecure library loading behavior. A locally authenticated attacker could run arbitrary code with elevated system privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. The security update addresses the vulnerability by correcting the input sanitization error to preclude unintended elevation.

Other sources

Windows Installer Elevation of Privilege Vulnerability

— Microsoft

Affected Software

32 affected componentsFixes available
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3231
10.0.28000.3231
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3231
10.0.28000.3231
Microsoft Windows 11=26H2, >=10.0.26300<10.0.26300.9711
10.0.26300.9711
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows 11=26H2, >=10.0.26300<10.0.26300.9711
10.0.26300.9711
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows Server 2012 R2<6.3.9600.23470
6.3.9600.23470
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9711
10.0.26100.9711
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9711
10.0.26200.9711
Microsoft Windows Server 2012<6.2.9200.26434
6.2.9200.26434
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9711
10.0.26200.9711
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9711
10.0.26100.9711
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7652
10.0.22631.7652
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7807
10.0.19044.7807
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7807
10.0.19044.7807
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7652
10.0.22631.7652
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7807
10.0.19045.7807
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7807
10.0.19044.7807
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7807
10.0.19045.7807
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7807
10.0.19045.7807
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9612
10.0.14393.9612
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9376
10.0.17763.9376
Microsoft Windows Server 2016<10.0.14393.9612
10.0.14393.9612
Microsoft Windows Server 2016<10.0.14393.9612
10.0.14393.9612
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9376
10.0.17763.9376
Microsoft Windows Server 2012<6.2.9200.26434
6.2.9200.26434
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9612
10.0.14393.9612
Microsoft Windows Server 2012 R2<6.3.9600.23470
6.3.9600.23470

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.28000.3231Patch KB5127646
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26300.9711Patch KB5127648
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.33650Patch KB5126646
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 6.3.9600.23470Patch KB5126836
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.20348.5761Patch KB5126655
  6. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.9711Patch KB5127648
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26200.9711Patch KB5127648
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 6.2.9200.26434Patch KB5126835
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.22631.7652Patch KB5126653
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19044.7807Patch KB5126657
  11. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19045.7807Patch KB5126657
  12. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.17763.9376Patch KB5126651
  13. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.14393.9612Patch KB5126868

Event History

Nov 10, 2026
CVE Published
via Microsoft·04:00 PM
Data Sourced
via Microsoft·04:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·04:00 PM
Affected Software
CVE Published
via MITRE·06:19 PM
Data Sourced
via MITRE·06:19 PM
DescriptionSeverity
Data Sourced
via NVD·07:17 PM
DescriptionSeverityWeakness

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