CVE-2026-83863: Servicing Stack Updates Elevation of Privilege Vulnerability

Published Oct 13, 2026
·
Updated

Heap-based buffer overflow in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.

Other sources

Servicing Stack Updates Elevation of Privilege Vulnerability

— Microsoft

Affected Software

32 affected componentsFixes available
Microsoft Windows 11=25H2
10.0.26200.9711
Microsoft Windows Server 2012<6.2.9200.26434, <6.2.9200.26426
6.2.9200.264346.2.9200.26426
Microsoft Windows Server 2012 R2<6.3.9600.23470, <6.3.9600.23457
6.3.9600.234706.3.9600.23457
Microsoft Windows 10=1809
10.0.17763.9376
Microsoft Windows 11=26H2
10.0.26300.9711
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows 11=23H2
10.0.22631.7652
Microsoft Windows 10=21H2
10.0.19044.7807
Microsoft Windows Server 2012 R2<6.3.9600.23470, <6.3.9600.23457
6.3.9600.234706.3.9600.23457
Microsoft Windows 10=21H2
10.0.19044.7807
Microsoft Windows Server 2016<10.0.14393.9612, <10.0.14393.9596
10.0.14393.961210.0.14393.9596
Microsoft Windows 11=26H2
10.0.26300.9711
Microsoft Windows 10=1607
10.0.14393.961210.0.14393.9596
Microsoft Windows 11=26H1
10.0.28000.3231
Microsoft Windows Server 2016<10.0.14393.9612, <10.0.14393.9596
10.0.14393.961210.0.14393.9596
Microsoft Windows Server 2012<6.2.9200.26434, <6.2.9200.26426
6.2.9200.264346.2.9200.26426
Microsoft Windows 11=24H2
10.0.26100.9711
Microsoft Windows 11=24H2
10.0.26100.9711
Microsoft Windows 11=25H2
10.0.26200.9711
Microsoft Windows 11=23H2
10.0.22631.7652
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows 10=1607
10.0.14393.961210.0.14393.9596
Microsoft Windows 10=22H2
10.0.19044.7807
Microsoft Windows 10=22H2
10.0.19044.7807
Microsoft Windows 10=22H2
10.0.19044.7807
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
Microsoft Windows 11=26H1
10.0.28000.3231
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows 10=21H2
10.0.19044.7807
Microsoft Windows 10=1809
10.0.17763.9376

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 10.0.26200.9711Patch KB5127648
  2. Upgrade

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

    Fixed in 10.0.17763.9376Patch KB5126651
  3. Upgrade

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

    Fixed in 6.3.9600.23470Fixed in 6.3.9600.23457Patch KB5127356
  4. Upgrade

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

    Fixed in 6.2.9200.26434Fixed in 6.2.9200.26426Patch KB5127357
  5. Upgrade

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

    Fixed in 10.0.26300.9711Patch KB5127648
  6. Upgrade

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

    Fixed in 10.0.26100.33650Patch KB5126646
  7. Upgrade

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

    Fixed in 10.0.22631.7652Patch KB5126653
  8. Upgrade

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

    Fixed in 10.0.19044.7807Patch KB5126657
  9. Upgrade

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

    Fixed in 10.0.14393.9612Fixed in 10.0.14393.9596Patch KB5126649
  10. Upgrade

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

    Fixed in 10.0.28000.3231Patch KB5127646
  11. Upgrade

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

    Fixed in 10.0.26100.9711Patch KB5127648
  12. Upgrade

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

    Fixed in 10.0.20348.5761Patch KB5126655

Event History

Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:00 PM
Data Sourced
via MITRE·07:00 PM
DescriptionSeverity

Frequently Asked Questions

1

Which Windows products are listed as affected?

Microsoft Windows 10, Windows 11, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025 are listed.

2

What level of access is required to exploit this issue?

The CVSS vector indicates local attack access and low privileges are required. No user interaction is required.

Company

Resources

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