IRONSMITHINTEL
MEDIUMCVSS6.5
|
Actively Exploited
|CISA KEV|CVE-2025-49706|Auth: none — unauthenticated|Reboot: required|Manual only

KB5002741: Windows Server Security Update (July 2025)

Microsoft SharePoint contains an improper authentication vulnerability that allows an authorized attacker to perform spoofing over a network. Successfully exploitation could allow an attacker to view sensitive information and make some changes to disclosed information. This vulnerability could be chained with CVE-2025-49704. CVE-2025-53771 is a patch bypass for CVE-2025-49706, and the updates for CVE-2025-53771 include more robust protection than those for CVE-2025-49706.

Published Jul 8, 2025 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve partial data exposure, partial data tampering. CISA has confirmed use of this vulnerability in known ransomware campaigns — treat as high priority for remediation. Federal agencies are required to remediate by 2025-07-23 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Improper Authentication (CWE-287) vulnerability in Microsoft SharePoint. Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network. 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:

●SharePoint Administrators
●IT Security
●Running sharepoint enterprise server: 2016; sharepoint server: v < 16.0.18526.20424, 2019
Fixed inKB5002741, KB5002744, KB5002751 (applies to 3 product versions) — build 16.0.10417.20027, 16.0.18526.20424+
Real-world incidentsWhat we've seen

Used in known ransomware campaigns. Threat-research write-up: https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/

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 CatalogKB5002741

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB5002741 — https://support.microsoft.com/help/5002741
    1
    KB5002744 — https://support.microsoft.com/help/5002744
    1
    KB5002751 — https://support.microsoft.com/help/5002751

Supersedes: KB5002729, KB5002732, KB5002736

Affected Products

    1
    Microsoft SharePoint Enterprise Server 2016
    1
    Microsoft SharePoint Server 2019
    1
    Microsoft SharePoint Server Subscription Edition

Fixed Build Numbers

    1
    16.0.10417.20027
    1
    16.0.18526.20424
    1
    16.0.5508.1000

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 KB5002741
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 KB5002741 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://www.microsoft.com/en-us/download/details.aspx?id=108257
    1
    https://www.microsoft.com/en-us/download/details.aspx?id=108259
    1
    https://www.microsoft.com/en-us/download/details.aspx?id=108262

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5002741','KB5002744','KB5002751') }

References

    1
    Microsoft Security Response Center: https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/
    1
    KB article: https://support.microsoft.com/help/5002741
    1
    KB article: https://support.microsoft.com/help/5002744
    1
    KB article: https://support.microsoft.com/help/5002751
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2025-49706
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-49706

Discovery Credit

Viettel Cyber Security with Trend Zero Day Initiative

PowerShell automationComing soon

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

References

↗ CVE-2025-49706↗ MSRC Advisory↗ NVD↗ KBKB5002741