Windows 10 must be configured to prevent certificate error overrides in Microsoft Edge.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-220842	SRG-OS-000480-GPOS-00227	WN10-CC-000238	SV-220842r991589_rule	2025-02-25	3

Description
Web security certificates provide an indication whether a site is legitimate. This policy setting prevents the user from ignoring Secure Sockets Layer/Transport Layer Security (SSL/TLS) certificate errors that interrupt browsing.

ℹ️ Check
This setting is applicable starting with v1809 of Windows 10; it is NA for prior versions. Windows 10 LTSC\B versions do not include Microsoft Edge; this is NA for those systems. If the following registry value does not exist or is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\MicrosoftEdge\Internet Settings\ Value Name: PreventCertErrorOverrides Type: REG_DWORD Value: 0x00000001 (1)

ℹ️ Check

This setting is applicable starting with v1809 of Windows 10; it is NA for prior versions. Windows 10 LTSC\B versions do not include Microsoft Edge; this is NA for those systems. If the following registry value does not exist or is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\MicrosoftEdge\Internet Settings\ Value Name: PreventCertErrorOverrides Type: REG_DWORD Value: 0x00000001 (1)

✔️ Fix
Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Edge >> "Prevent certificate error overrides" to "Enabled".