IRONSMITHINTEL
HIGHCVSS8.8
|
Actively Exploited
|CISA KEV|CVE-2022-26923|Auth: low — authenticated user|Reboot: required|Manual only

KB5013942: Windows Server Security Update (May 2022)

An authenticated user could manipulate attributes on computer accounts they own or manage, and acquire a certificate from Active Directory Certificate Services that would allow for privilege escalation to SYSTEM.

Published May 10, 2022 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, with a low-privilege account, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2022-09-08 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Improper Certificate Validation (CWE-295) vulnerability in Microsoft Active Directory. Active Directory Domain Services Elevation of Privilege Vulnerability Exploitation requires remote network access, low attack complexity, a low-privilege authenticated account, and no user interaction required.

Am I affected?Quick check

Probably yes if any of these apply:

●IT Security
●Running windows 10 1507: v < 10.0.10240.19297; windows 10 1607: v < 10.0.14393.5850; windows 10 1809: v < 10.0.17763.4252; windows 10 1909: v < 10.0.18363.2274; windows 10 20h2: v < 10.0.19042.1706; windows 10 21h1: v < 10.0.19043.1706; windows 10 21h2: v < 10.0.19044.1706; windows 11 21h2: v < 10.0.22000.1817; windows 8.1: -; windows rt 8.1: -; windows server 2012: r2; windows server 2016: v < 10.0.14393.5850; windows server 2019: v < 10.0.17763.4252; windows server 2022: v < 10.0.20348.1668
Fixed inKB5013942, KB5013945, KB5013963, KB5014001, KB5014011, KB5014025, KB5025224, KB5025228, KB5025229, KB5025230, KB5025285, KB5025288 (applies to 32 product versions) — build 10.0.10240.19297, 10.0.14393.5850+
Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2022-08-18 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2022-09-08.

How to patch

Manual download

For air-gapped servers or out-of-band deployment. Microsoft Update Catalog returns every OS-version variant of this update.

↗ Microsoft Update CatalogKB5013942

Manual remediation steps

Apply the Microsoft Security Update

Microsoft has released an official security update that fixes this vulnerability.

Required KB Updates

    1
    KB5013942 — https://support.microsoft.com/help/5013942
    1
    KB5013945 — https://support.microsoft.com/help/5013945
    1
    KB5013963 — https://support.microsoft.com/help/5013963
    1
    KB5014001 — https://support.microsoft.com/help/5014001
    1
    KB5014011 — https://support.microsoft.com/help/5014011
    1
    KB5014025 — https://support.microsoft.com/help/5014025
    1
    KB5025224 — https://support.microsoft.com/help/5025224
    1
    KB5025228 — https://support.microsoft.com/help/5025228
    1
    KB5025229 — https://support.microsoft.com/help/5025229
    1
    KB5025230 — https://support.microsoft.com/help/5025230
    1
    KB5025285 — https://support.microsoft.com/help/5025285
    1
    KB5025288 — https://support.microsoft.com/help/5025288

Supersedes: KB5012591, KB5012599, KB5012653, KB5012670, KB5023697, KB5023698, KB5023702, KB5023705, KB5023765

Affected Products

    1
    Windows 10 Version 1607 for 32-bit Systems
    1
    Windows 10 Version 1607 for x64-based Systems
    1
    Windows 10 Version 1809 for 32-bit Systems
    1
    Windows 10 Version 1809 for ARM64-based Systems
    1
    Windows 10 Version 1809 for x64-based Systems
    1
    Windows 10 Version 1909 for 32-bit Systems
    1
    Windows 10 Version 1909 for ARM64-based Systems
    1
    Windows 10 Version 1909 for x64-based Systems
    1
    Windows 10 Version 20H2 for 32-bit Systems
    1
    Windows 10 Version 20H2 for ARM64-based Systems
    1
    Windows 10 Version 21H1 for 32-bit Systems
    1
    Windows 10 Version 21H1 for ARM64-based Systems
    1
    Windows 10 Version 21H1 for x64-based Systems
    1
    Windows 10 Version 21H2 for 32-bit Systems
    1
    Windows 10 Version 21H2 for ARM64-based Systems
    1
    Windows 10 Version 21H2 for x64-based Systems
    1
    Windows 10 for 32-bit Systems
    1
    Windows 10 for x64-based Systems
    1
    Windows 11 version 21H2 for ARM64-based Systems
    1
    Windows 11 version 21H2 for x64-based Systems
    1
    (…12 more product versions)

Fixed Build Numbers

    1
    10.0.10240.19297
    1
    10.0.14393.5850
    1
    10.0.17763.4252
    1
    10.0.18363.2274
    1
    10.0.19042.1706
    1
    10.0.19043.1706
    1
    10.0.19044.1706
    1
    10.0.20348.1668
    1
    10.0.22000.1817
    1
    6.3.9600.20365
    1
    (…3 more builds)

Installation Methods

Windows Update (recommended)

1
Settings → Windows Update → Check for updates
2
The security update is offered if your system is in scope
3
Restart when prompted — a reboot IS required to complete the install

Microsoft Update Catalog (manual download)

1
Open https://catalog.update.microsoft.com
2
Search for KB5013942
3
Download the package matching your OS architecture and Windows build
4
Run the .msu installer with administrator privileges
5
Restart when prompted

WSUS / SCCM / Intune

Approve KB5013942 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5013942
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5013945
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5013963
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5014001
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5014011
    1
    (…7 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5013942','KB5013945','KB5013963','KB5014001','KB5014011','KB5014025','KB5025224','KB5025228','KB5025229','KB5025230','KB5025285','KB5025288') }

References

    1
    Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2022-26923
    1
    KB article: https://support.microsoft.com/help/5013942
    1
    KB article: https://support.microsoft.com/help/5013945
    1
    KB article: https://support.microsoft.com/help/5013963
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2022-26923
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26923

Discovery Credit

Oliver Lyak (@ly4k_) of Institut For Cyber Risk working with Trend Micro Zero Day Initiative

PowerShell automationComing soon

No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.

References

↗ CVE-2022-26923↗ MSRC Advisory↗ NVD↗ KBKB5013942