IRONSMITHINTEL
CRITICALCVSS9.8
|
Actively Exploited
|CISA KEV|CVE-2019-0604|Auth: none — unauthenticated|Reboot: required|Manual only

KB4461630: Windows Server Security Update (March 2019)

Microsoft SharePoint fails to check the source markup of an application package. An attacker who successfully exploits the vulnerability could run remote code in the context of the SharePoint application pool and the SharePoint server farm account.

Published Mar 5, 2019 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, 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 2022-05-03 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Improper Input Validation (CWE-20) vulnerability in Microsoft SharePoint. A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package, aka 'Microsoft SharePoint Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0594. 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 foundation: 2013; sharepoint server: 2010, 2019
Fixed inKB4461630, KB4462143, KB4462184, KB4462199, KB4462202, KB4462211 (applies to 6 product versions)
Real-world incidentsWhat we've seen

CISA confirms this CVE has been used in known ransomware campaigns. Added to the KEV catalog on 2021-11-03; federal agencies required to remediate by 2022-05-03.

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 CatalogKB4461630

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB4461630 — https://support.microsoft.com/help/4461630
    1
    KB4462143 — https://support.microsoft.com/help/4462143
    1
    KB4462184 — https://support.microsoft.com/help/4462184
    1
    KB4462199 — https://support.microsoft.com/help/4462199
    1
    KB4462202 — https://support.microsoft.com/help/4462202
    1
    KB4462211 — https://support.microsoft.com/help/4462211

Supersedes: KB4461580, KB4461596, KB4462139, KB4462155, KB4462171

Affected Products

    1
    Microsoft SharePoint Enterprise Server 2016
    1
    Microsoft SharePoint Foundation 2010 Service Pack 2
    1
    Microsoft SharePoint Foundation 2013 Service Pack 1
    1
    Microsoft SharePoint Server 2010 Service Pack 2
    1
    Microsoft SharePoint Server 2013 Service Pack 1
    1
    Microsoft SharePoint Server 2019

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 KB4461630
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 KB4461630 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://www.microsoft.com/downloads/details.aspx?familyid=3b5c9aa5-db7c-45d5-be1b-2ef5c52ca223
    1
    https://www.microsoft.com/downloads/details.aspx?familyid=7a78892a-d8d2-4154-871d-22dde393be2a
    1
    https://www.microsoft.com/downloads/details.aspx?familyid=bb98da67-5aa3-41eb-929d-d182a746aa52
    1
    https://www.microsoft.com/downloads/details.aspx?familyid=d43632da-bbbe-4ac2-8365-df209a207eae
    1
    https://www.microsoft.com/downloads/details.aspx?familyid=d7a12d15-0230-487d-a2cf-ceb50a424559
    1
    (…1 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB4461630','KB4462143','KB4462184','KB4462199','KB4462202','KB4462211') }

References

    1
    Microsoft Security Response Center: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0604
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2019-0604
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0604

Discovery Credit

Markus Wulftange (@mwulftange) working with Trend Micro's Zero Day Initiative

PowerShell automationComing soon

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

References

↗ CVE-2019-0604↗ MSRC Advisory↗ NVD↗ KBKB4461630