A web server may host one too many applications. Each application will need certain system resources and privileged operations to operate correctly. The web server must be configured to contain and control the applications and protect the system resources and privileged operations from those not needed by the application for operation.
Limiting the application will confine the potential harm a compromised application could cause to a system.
Check
Review the web server documentation and configuration to determine the access to server resources given to hosted applications.
If hosted applications have access to more system resources than needed for operation, this is a finding.
Fix
Configure the privileges given to hosted applications to the minimum required for application operation.