IRONSMITHINTEL
HIGHCVSS7.8
|
Actively Exploited
|CISA KEV|CVE-2024-26169|Auth: low — authenticated user|Reboot: required|Manual only

KB5035845: Windows Server Security Update (March 2024)

Microsoft Windows Error Reporting Service contains an improper privilege management vulnerability that allows a local attacker with user permissions to gain SYSTEM privileges.

Published Mar 12, 2024 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A local attacker, with a low-privilege account, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. CISA has confirmed use of this vulnerability in known ransomware campaigns — treat as high priority for remediation. Federal agencies are required to remediate by 2024-07-04 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Improper Privilege Management (CWE-269) vulnerability in Microsoft Windows. Windows Error Reporting Service Elevation of Privilege Vulnerability Exploitation requires local 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:

●Windows Administrators
●Systems Engineers
●IT Security
●Running windows 10 1507: v < 10.0.10240.20526; windows 10 1607: v < 10.0.14393.6796; windows 10 1809: v < 10.0.17763.5576; windows 10 21h2: v < 10.0.19044.4170; windows 10 22h2: v < 10.0.19045.4170; windows 11 21h2: v < 10.0.22000.2836; windows 11 22h2: v < 10.0.22621.3296; windows 11 23h2: v < 10.0.22631.3296; windows server 2008: -, r2; windows server 2012: r2; windows server 2016: -; windows server 2019: v < 10.0.17763.5576; windows server 2022: v < 10.0.20348.2333; windows server 2022 23h2: v < 10.0.25398.763
Fixed inKB5035845, KB5035849, KB5035853, KB5035854, KB5035855, KB5035856, KB5035857, KB5035858, KB5035885, KB5035959 (applies to 28 product versions) — build 10.0.10240.20526, 10.0.14393.6796+
Real-world incidentsWhat we've seen

CISA confirms this CVE has been used in known ransomware campaigns. Added to the KEV catalog on 2024-06-13; federal agencies required to remediate by 2024-07-04.

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 CatalogKB5035845

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB5035845 — https://support.microsoft.com/help/5035845
    1
    KB5035849 — https://support.microsoft.com/help/5035849
    1
    KB5035853 — https://support.microsoft.com/help/5035853
    1
    KB5035854 — https://support.microsoft.com/help/5035854
    1
    KB5035855 — https://support.microsoft.com/help/5035855
    1
    KB5035856 — https://support.microsoft.com/help/5035856
    1
    KB5035857 — https://support.microsoft.com/help/5035857
    1
    KB5035858 — https://support.microsoft.com/help/5035858
    1
    KB5035885 — https://support.microsoft.com/help/5035885
    1
    KB5035959 — https://support.microsoft.com/help/5035959

Supersedes: KB5034763, KB5034765, KB5034766, KB5034767, KB5034768, KB5034769, KB5034770, KB5034774, KB5034819, KB5034860

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 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 Version 22H2 for 32-bit Systems
    1
    Windows 10 Version 22H2 for ARM64-based Systems
    1
    Windows 10 Version 22H2 for x64-based Systems
    1
    Windows 10 for 32-bit Systems
    1
    Windows 10 for x64-based Systems
    1
    Windows 11 Version 22H2 for ARM64-based Systems
    1
    Windows 11 Version 22H2 for x64-based Systems
    1
    Windows 11 Version 23H2 for ARM64-based Systems
    1
    Windows 11 Version 23H2 for x64-based Systems
    1
    Windows 11 version 21H2 for ARM64-based Systems
    1
    Windows 11 version 21H2 for x64-based Systems
    1
    Windows Server 2012 R2
    1
    (…8 more product versions)

Fixed Build Numbers

    1
    10.0.10240.20526
    1
    10.0.14393.6796
    1
    10.0.17763.5576
    1
    10.0.19044.4170
    1
    10.0.19045.4170
    1
    10.0.20348.2333
    1
    10.0.20348.2340
    1
    10.0.22000.2836
    1
    10.0.22621.3296
    1
    10.0.22631.3296
    1
    (…2 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 KB5035845
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 KB5035845 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5035845
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5035849
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5035853
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5035854
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5035855
    1
    (…5 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5035845','KB5035849','KB5035853','KB5035854','KB5035855','KB5035856','KB5035857','KB5035858','KB5035885','KB5035959') }

References

    1
    Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26169
    1
    KB article: https://support.microsoft.com/help/5035845
    1
    KB article: https://support.microsoft.com/help/5035849
    1
    KB article: https://support.microsoft.com/help/5035853
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2024-26169
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-26169

Discovery Credit

Naceri with MSRC Vulnerabilities & Mitigations

PowerShell automationComing soon

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

References

↗ CVE-2024-26169↗ MSRC Advisory↗ NVD↗ KBKB5035845