Introduction
Microsoft released the following security updates for Office in September 2025. These updates are intended to help our customers keep their computers up to date. We recommend that you install all updates that apply to you.
To download an update, select the corresponding Knowledge Base article in the following list.
List of Office updates released in September 2025
Microsoft Office 2016
SharePoint Server Subscription Edition
| Product | Knowledge Base article title and number |
|---|---|
| SharePoint Server Subscription Edition | Description of the security update for SharePoint Server Subscription Edition: September 09, 2025 (KB5002784) |
Microsoft SharePoint Server 2019
| Product | Knowledge Base article title and number |
|---|---|
| SharePoint Server 2019 | Description of the security update for SharePoint Server 2019: September 09, 2025 (KB5002775) |
| SharePoint Server 2019 Language Pack | Description of the security update for SharePoint Server 2019 Language Pack: September 09, 2015 (KB5002774) |
Microsoft SharePoint Server 2016
| Product | Knowledge Base article title and number |
|---|---|
| SharePoint Server 2016 | Description of the security update for SharePoint Server 2016: September 09, 2025 (KB5002778) |
| SharePoint Server 2016 Language Pack | Description of the security update for SharePoint Server 2016 Language Pack: September 09, 2015 (KB5002777) |
Office Online Server
| Product | Knowledge Base article title and number |
|---|---|
| Office Online Server | Description of the security update for Office Online Server: September 09, 2015 (KB5002776) |