The ability to run unsecure Office web add-ins and Catalogs must be disabled.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-238041	SRG-APP-000516	DTOO412	SV-238041r961863_rule	2024-12-06	2

Description
This policy setting allows users to run unsecure web add-in, which are add-ins that have web page or catalog locations that are not SSL-secured (https://), and are not in users' Internet zones. If you enable this policy setting, users can run unsecure apps. To enable specific unsecure web add-ins, you must also configure the Trusted Web add-in Catalog policy settings to trust the catalogs that contains those Add-ins. If you disable or do not configure this policy setting, unsecure web add-ins are not allowed.

Description

This policy setting allows users to run unsecure web add-in, which are add-ins that have web page or catalog locations that are not SSL-secured (https://), and are not in users' Internet zones. If you enable this policy setting, users can run unsecure apps. To enable specific unsecure web add-ins, you must also configure the Trusted Web add-in Catalog policy settings to trust the catalogs that contains those Add-ins. If you disable or do not configure this policy setting, unsecure web add-ins are not allowed.

ℹ️ Check
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings -> Trust Center -> Trusted Catalogs "Allow Unsecure web add-ins and Catalogs" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\Microsoft\office\16.0\wef\trustedcatalogs Criteria: If the value requireserververification is REG_DWORD = 1, this is not a finding.

ℹ️ Check

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings -> Trust Center -> Trusted Catalogs "Allow Unsecure web add-ins and Catalogs" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\Microsoft\office\16.0\wef\trustedcatalogs Criteria: If the value requireserververification is REG_DWORD = 1, this is not a finding.

✔️ Fix
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings -> Trust Center -> Trusted Catalogs "Allow Unsecure web add-ins and Catalogs" to "Disabled".