The Update BureauKB5002816: Cumulative update for SharePoint Server, version 2019, December 2025. Outlook and Word code-execution flaws addressed; certification issue fixed
The update addresses four Important vulnerabilities affecting Outlook and Word, and fixes a GB18030-2022 China certification issue in SharePoint Server 2019.
Does it affect you? Applies to: Farms running the release version of SharePoint Server 2019. The update package is for x64 systems.
Microsoft ships this release as two packages: KB5002816, the update itself, and KB5002802 for the language packs. Install both on every server of the farm, then run the SharePoint Products Configuration Wizard.
What changes
Fixes 2 changes
Microsoft Outlook and Word
For: SharePoint farm administrators
-
The update resolves remote code execution vulnerabilities affecting Microsoft Outlook and Microsoft Word.1
Addresses CVE-2025-62562, CVE-2025-62559, CVE-2025-62558, and CVE-2025-62555.
SharePoint Server
For: SharePoint farm administrators
- The GB18030-2022 China certification issue is fixed.2
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2025-12-09
- Classification
- Security Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5002803, KB5002796, KB5002775, KB5002769
- Replaced by
- KB5002825
| Version | Build | Channel |
|---|---|---|
| 2019 | 16.0.10417.20075 | General availability |
Security
| Vulnerability | Severity | CVSS |
|---|---|---|
|
Microsoft Word Remote Code Execution Vulnerability
|
Important | 7.8 |
|
Microsoft Word Remote Code Execution Vulnerability
|
Important | 7.8 |
|
Microsoft Outlook Remote Code Execution Vulnerability
|
Important | 7.8 |
|
Microsoft Word Remote Code Execution Vulnerability
|
Important | 7.0 |
Downloads (Microsoft Update Catalog)
Language packs (50)
- Arabic (Saudi Arabia)
- Azerbaijani (Latin, Azerbaijan)
- Basque (Spain)
- Bosnian (Latin, Bosnia & Herzegovina)
- Bulgarian (Bulgaria)
- Catalan (Spain)
- Chinese (China)
- Chinese (Taiwan)
- Croatian (Croatia)
- Czech (Czechia)
- Danish (Denmark)
- Dari (Afghanistan)
- Dutch (Netherlands)
- English (United States)
- Estonian (Estonia)
- Finnish (Finland)
- French (France)
- Galician (Spain)
- German (Germany)
- Greek (Greece)
- Hebrew (Israel)
- Hindi (India)
- Hungarian (Hungary)
- Indonesian (Indonesia)
- Irish (Ireland)
- Italian (Italy)
- Japanese (Japan)
- Kazakh (Kazakhstan)
- Korean (South Korea)
- Latvian (Latvia)
- Lithuanian (Lithuania)
- Macedonian (North Macedonia)
- Malay (Malaysia)
- Norwegian Bokmål (Norway)
- Polish (Poland)
- Portuguese (Brazil)
- Portuguese (Portugal)
- Romanian (Romania)
- Russian (Russia)
- Serbian (Cyrillic, Serbia)
- Serbian (Latin, Serbia)
- Slovak (Slovakia)
- Slovenian (Slovenia)
- Spanish (Spain)
- Swedish (Sweden)
- Thai (Thailand)
- Turkish (Türkiye)
- Ukrainian (Ukraine)
- Vietnamese (Vietnam)
- Welsh (United Kingdom)
Sources
Cited passages from Microsoft's official notes (2)
-
1.
This security update resolves a Microsoft Outlook Remote Code Execution vulnerability and Microsoft Word Remote Code Execution vulnerability.
support.microsoft.com -
2.
This update fixes the GB18030-2022 China certification issue.
support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Oct 20, 2026
- Quotes found in the official pages: passed
- Numbers found in the sources: passed
- Vulnerabilities from the dossier only: passed
- Links to allowed domains only: passed
- Every official change covered: passed
- Readable plain text: passed
- Changes confirmed by the file list: passed
- Sources agree: passed
A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 5/5. How we work
Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake