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Microsoft Security Response CenterCVE-2026-85793

Windows Sysmain Service Information Disclosure Vulnerability

HighVendor CVSS 5.5 / 10 1 CVE Published Oct 13, 2026 at 7:00 AM UTC
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Summary

Exposure of sensitive system information to an unauthorized control sphere in Windows Sysmain Service allows an authorized attacker to disclose information locally.

Products covered

  • Windows 10 Version 1809 for 32-bit Systems

  • Windows 10 Version 1809 for x64-based Systems

  • Windows Server 2019

  • Windows Server 2019 (Server Core installation)

  • Windows 10 Version 21H2 for 32-bit Systems

  • Windows 10 Version 21H2 for ARM64-based Systems

  • Windows 10 Version 21H2 for x64-based Systems

  • Windows 10 Version 22H2 for x64-based Systems

Show 16 more products

  • Windows 10 Version 22H2 for ARM64-based Systems

  • Windows 10 Version 22H2 for 32-bit Systems

  • Windows 11 Version 25H2 for ARM64-based Systems

  • Windows 11 Version 25H2 for x64-based Systems

  • Windows 11 Version 23H2 for ARM64-based Systems

  • Windows 11 Version 23H2 for x64-based Systems

  • Windows 11 Version 24H2 for ARM64-based Systems

  • Windows 11 Version 24H2 for x64-based Systems

  • Windows 11 version 26H1 for x64-based Systems

  • Windows 11 Version 26H1 for ARM64-based Systems

  • Windows 10 Version 1607 for 32-bit Systems

  • Windows 10 Version 1607 for x64-based Systems

  • Windows Server 2016

  • Windows Server 2016 (Server Core installation)

  • Windows 11 Version 26H2 for ARM64-based Systems

  • Windows 11 Version 26H2 for x64-based Systems

Remediation

Install KB5126651. Install KB5126657. Install KB5127648. Install KB5126653. Install KB5127646. Install KB5126868.

Vendor-listed fixes

  • 10.0.17763.9376

  • 10.0.19044.7807

  • 10.0.19045.7807

  • 10.0.26200.9711

  • 10.0.22631.7652

  • 10.0.26100.9711

  • 10.0.28000.3231

  • 10.0.14393.9612

Show 1 more fixes

  • 10.0.26300.9711

CVEs in this advisory 1

CVE-2026-85793
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 fixed versions: 10.0.19045.7807.

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

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