Bypassing of Microsoft Defender SmartScreen warnings about downloads must be disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-235721	EDGE-00-000003	SV-235721r960852_rule		Medium

Description

This policy setting allows a decision to be made on whether users can override Microsoft Defender SmartScreen warnings about unverified downloads. If this setting is enabled, users cannot ignore Microsoft Defender SmartScreen warnings, and are prevented from completing the unverified downloads. If this policy is disabled or not configured, users can ignore Microsoft Defender SmartScreen warnings and complete unverified downloads.

STIG	Date
Microsoft Edge Security Technical Implementation Guide	2024-09-13

Details

Check Text (C-38940r766833_chk)

The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Prevent bypassing of Microsoft Defender SmartScreen warnings about downloads" must be set to "Enabled".

Use the Windows Registry Editor to navigate to the following key:
HKLM\SOFTWARE\Policies\Microsoft\Edge

If the value for "PreventSmartScreenPromptOverrideForFiles" is not set to "REG_DWORD = 1", this is a finding.

If this machine is on SIPRNet, this is Not Applicable.

Fix Text (F-38903r766834_fix)

Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Prevent bypassing of Microsoft Defender SmartScreen warnings about downloads" must to "Enabled".