SharePoint on-premises is Microsoft’s self-hosted collaboration platform for document sharing, portals, workflows, and intranet sites. Unlike SharePoint Online, it runs inside an organization’s own datacenter or private cloud, usually behind Windows Server, IIS, and Active Directory. That gives defenders more control, but it also means the security of the application depends on patching, hardening, and network exposure.
In cyber security, SharePoint on-premises matters because it is often internet-facing and stores valuable business data. Attackers look for web-layer bugs, authentication bypasses, and deserialization or code-execution flaws that can be chained into full server compromise. Once inside, they may steal documents, plant web shells, or use the server as a pivot point into the internal network. Defenders reduce risk by applying updates quickly, limiting exposure, enforcing strong authentication, rotating machine keys when needed, and monitoring IIS and SharePoint logs for suspicious requests.