Vulnerability Discussion

Toast notifications that are displayed on the lock screen could display sensitive information to unauthorized personnel. Turning off this feature will limit access to the information to a logged on user.

Check

Note: This Check must be performed for each interactive user profile on the system.
If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_CURRENT_USER
Registry Path: \SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\PushNotifications\

Value Name: NoToastApplicationNotificationOnLockScreen

Value Type: REG_DWORD
Value: 1

Note: This requirement is applicable to profiles for interactive logins. It is not applicable for Service accounts.

To determine the system's enabled user profiles:
Run "PowerShell" as an administrator.

Execute the following command:
Get-LocalUser | Where-Object {$_.Enabled -eq $true}

Fix

For each user profile on the system, configure the policy value for User Configuration >> Administrative Templates >> Start Menu and Taskbar >> Notifications >> "Turn off toast notifications on the lock screen" to "Enabled".