IRONSMITHINTEL
MEDIUMCVSS5.3
|
Actively Exploited
|CISA KEV|CVE-2023-41763|Auth: none — unauthenticated|Reboot: required|Manual only

KB3061064: Windows Server Security Update (October 2023)

Microsoft Skype for Business contains an unspecified vulnerability that allows for privilege escalation.

Published Oct 10, 2023 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve partial data exposure. Federal agencies are required to remediate by 2023-10-31 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Server-Side Request Forgery (SSRF) (CWE-918) vulnerability in Microsoft Skype for Business. Skype for Business Elevation of Privilege Vulnerability Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

📧

Phishing link

→

🖼

Malicious file

🔓

Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●IT Security
●Running skype for business server: 2015, 2019
Fixed inKB3061064, KB4470124 (applies to 2 product versions) — build 6.0.9319.869, 7.0.246.530
Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2023-10-10 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2023-10-31.

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 CatalogKB3061064

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB3061064 — https://support.microsoft.com/help/3061064
    1
    KB4470124 — https://support.microsoft.com/help/4470124

Affected Products

    1
    Skype for Business Server 2015 CU13
    1
    Skype for Business Server 2019 CU7

Fixed Build Numbers

    1
    6.0.9319.869
    1
    7.0.246.530

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 (may or may not be required for this update)

Microsoft Update Catalog (manual download)

1
Open https://catalog.update.microsoft.com
2
Search for KB3061064
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 KB3061064 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://www.microsoft.com/download/details.aspx?familyid=0d08ed37-106a-456f-a5c6-61df22588bec

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB3061064','KB4470124') }

References

    1
    Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-41763
    1
    KB article: https://support.microsoft.com/help/3061064
    1
    KB article: https://support.microsoft.com/help/4470124
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2023-41763
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-41763

Discovery Credit

Anonymous, Dr. Florian Hauser (@frycos) with Code White GmbH

PowerShell automationComing soon

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

References

↗ CVE-2023-41763↗ MSRC Advisory↗ NVD↗ KBKB3061064