With Feature Update 22H2 last November we added AMSI support for SharePoint Server Subscription Edition.
Today with March 2023 CU for SharePoint Server 2019 we have added the same functionality to SharePoint Server 2019.
The cybersecurity landscape has fundamentally changed, as evidenced by large-scale, complex attacks, and signals that human-operated ransomware are on the rise. More than ever, it’s critical to keep your on-premises infrastructure secure and up to date, including SharePoint Servers.
To help customers secure their environments and respond to associated threats from the attacks, we’re introducing integration between SharePoint Server and the Windows Antimalware Scan Interface (AMSI). AMSI is a versatile standard that allows applications and services to integrate with any AMSI-capable anti-malware product present on a computer.
The AMSI integration functionality is designed to prevent malicious web requests from reaching SharePoint endpoints. For example, to exploit a security vulnerability in a SharePoint endpoint before the official fix for the security vulnerability has been installed.
Read more in the official documentation of AMSI Support for SharePoint Server: