Summary
Important:
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If you're currently running SharePoint Workflow Manager, you must install SharePoint Workflow Manager (KB5002799) to your farm before you install this cumulative update.
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If you're currently running the Classic version of Workflow Manager, you have to enable the debug flag in order to continue using it:$farm = Get-SPFarm
$farm.ServerDebugFlags.Add(53601)
$farm.update()
iisreset
This security update resolves Microsoft SharePoint Server Remote Code Execution vulnerability. To learn more about the vulnerability, see the following security advisories:
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Microsoft Common Vulnerabilities and Exposures CVE-2026-40357
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Microsoft Common Vulnerabilities and Exposures CVE-2026-33112
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Microsoft Common Vulnerabilities and Exposures CVE-2026-33110
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Microsoft Common Vulnerabilities and Exposures CVE-2026-40368
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Microsoft Common Vulnerabilities and Exposures CVE-2026-35439
Notes:
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This is build 16.0.19725.20280 of the security update package.
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To apply this security update, you must have the release version of Microsoft SharePoint Server Subscription Edition installed on the computer.
Improvements and fixes
This security update contains improvements and fixes for the following nonsecurity issues in SharePoint Server Subscription Edition:
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This update improves accessibility by enabling keyboard navigation to column headers in the SPList Quick Edit view.
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This update resolves an issue in which pages don't load because certain user controls are flagged as unsafe for security. After you install this fix, you can explicitly trust the affected controls by configuring the appropriate custom farm property, (AllowedTagPrefixesWhichAreNotWebControlsList).
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This update fixes an issue in which customers encounter a “Sorry, something went wrong” screen when they update settings in the Configure and Health SA page. It also resolves a problem in which PowerShell incorrectly reports a “Database already exists” error, even if customers are only updating settings against an existing database.
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This update improves ingestion throughput by increasing the hit rate of the cache that's used during the ingestion process.
How to get and install the update
Method 1: Microsoft Update
This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.
Method 2: Microsoft Update Catalog
To get the standalone package for this update, go to the Microsoft Update Catalog website.
Method 3: Microsoft Download Center
You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.
More information
Security update deployment information
For deployment information about this update, see Deployments - Security Update Guide.
Security update replacement information
This security update replaces previously released security update 5002853.
File hash information
|
File name |
SHA256 hash |
|---|---|
|
uber-subscription-kb5002863-fullfile-x64-glb.exe |
E2B144E8C5F7F85F147EA3B553E5D5487685741D96E7E5E1951F0EC9AAF4BF20 |
File information
Download the list of files that are included in Security Update 5002863.
Information about protection and security
Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security
