September 2023 CU for SharePoint Server 2016 is available for download:

The product group released the September 2023 Cumulative Update for SharePoint Server 2016 product family.

This CU also includes Feature Pack 1 which was released with December 2016 CU and Feature Pack 2 which was released with September 2017 CU

The KB articles for September 2023 CU should be available at the following locations in a couple of hours:

• KB 5002494 – September 2023 Update for SharePoint Server 2016 (language independent)
  This is also a security update!
• KB 5002501 – September 2023 Update for SharePoint Server 2016 (language dependent)
  This is also a security update!

The downloads for September 2023 CU are available through the following links:

• Download September 2023 Update for SharePoint Server 2016 (language independent)
  This is also a security update!
• Download September 2023 Update for SharePoint Server 2016 (language dependent)
  This is also a security update!

SharePoint 2016 September 2023 CU Build Numbers:

Language independent fix: 16.0.5413.1001
Language dependent fix: 16.0.5413.1000

    

I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.