Exchange local machine policy must require signed scripts.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-259664	EX19-MB-000061	SV-259664r1015275_rule		Medium

Description

Scripts often provide a way for attackers to infiltrate a system, especially scripts downloaded from untrusted locations. By setting machine policy to prevent unauthorized script executions, unanticipated system impacts can be avoided. Failure to allow only signed remote scripts reduces the attack vector vulnerabilities from unsigned remote scripts.

STIG	Date
Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide	2025-05-14

Details

Check Text (C-63403r942304_chk)

Open the Exchange Management Shell and enter the following command:

Get-ExecutionPolicy

If the value returned is not "RemoteSigned", this is a finding.

Fix Text (F-63311r942305_fix)

Open the Exchange Management Shell and enter the following command:

Set-ExecutionPolicy RemoteSigned