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Unsigned add-ins in PowerPoint must be blocked with no Trust Bar Notification to the user.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-223384O365-PT-000008SV-223384r1016170_ruleCCI-003992medium
Description
This policy setting controls whether the specified Office application notifies users when unsigned application add-ins are loaded or silently disable such add-ins without notification. This policy setting only applies if the "Require that application add-ins are signed by Trusted Publisher" policy setting is enabled, which prevents users from changing this policy setting. If this policy setting is enabled, applications automatically disable unsigned add-ins without informing users. If this policy setting is disabled, if this application is configured to require that all add-ins be signed by a trusted publisher, any unsigned add-ins the application loads will be disabled and the application will display the Trust Bar at the top of the active window. The Trust Bar contains a message that informs users about the unsigned add-in. If this policy setting is not configured, the disable behavior applies, and in addition, users can configure this requirement themselves in the "Add-ins" category of the Trust Center for the application.
STIGDate
Microsoft Office 365 ProPlus Security Technical Implementation Guide2025-03-05

Related Frameworks

2 mappings across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CHG-04.2Signed Components
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (13) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-2(10)Shared and Group Account Credential Change
1.00
AU-4Audit Log Storage Capacity
1.00
CM-14Signed Components
1.00
CM-5(1)Automated Access Enforcement and Audit Records
1.00
CM-5(3)Signed Components
1.00
CM-7Least Functionality
1.00
CM-7(5)Authorized Software — Allow-by-exception
1.00
IA-2(5)Individual Authentication with Group Authentication
1.00
SC-2Separation of System and User Functionality
1.00
SC-23Session Authenticity
1.00

+3 more (top 10 by confidence shown)

CCI2 mappings
CCI-001749
1.00
CCI-003992
1.00

Details

Check Text (C-223384r1016170_chk)

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft PowerPoint 2016 >> PowerPoint Options >> Security >> Trust Center "Disable Trust Bar Notification for unsigned application add-ins and block them" is set to "Enabled". Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\Microsoft\office\16.0\powerpoint\security If the value notbpromptunsignedaddin is REG_DWORD = 1, this is not a finding.

Fix Text (F-25045r442372_fix)

Set the policy value for User Configuration >> Administrative Templates >> Microsoft PowerPoint 2016 >> PowerPoint Options >> Security >> Trust Center "Disable Trust Bar Notification for unsigned application add-ins and block them" to "Enabled".