Browsers STIGs
CAT I 1
Any vulnerability, the exploitation of which will directly and immediately result in loss of confidentiality, availability or integrity.
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The version of Microsoft Edge running on the system must be a supported version.
Maps to SI-2 via CCI-002605Check
Cross-reference the build information displayed with the Microsoft Edge site to identify, at minimum, the oldest supported build available. If the installed version of Edge is not supported by Microsoft, this is a finding.
Fix
Install a supported version of Edge.
CAT II 50
Any vulnerability, the exploitation of which has a potential to result in loss of confidentiality, availability or integrity.
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Bypassing Microsoft Defender SmartScreen prompts for sites must be disabled.
Maps to MA-3(2) via CCI-000870Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Prevent bypassing Microsoft Defender SmartScreen prompts for sites" 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 "PreventSmartScreenPromptOverride" is not set to "REG_DWORD = 1", this is a finding. If this machine is on SIPRNet, this is Not Applicable.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Prevent bypassing Microsoft Defender SmartScreen prompts for sites" to "Enabled".
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Bypassing of Microsoft Defender SmartScreen warnings about downloads must be disabled.
Maps to MA-3(2) via CCI-000870Check
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
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".
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InPrivate mode must be disabled.
Maps to AU-10 via CCI-000166Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Configure InPrivate mode availability" must be set to "enabled" with the option value set to "InPrivate mode disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "InPrivateModeAvailability" is not set to "REG_DWORD = 1", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Configure InPrivate mode availability" to "enabled" and select "InPrivate mode disabled".
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Background processing must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Continue running background apps after Microsoft Edge closes" must be set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "BackgroundModeEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Continue running background apps after Microsoft Edge closes" to "Disabled".
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The ability of sites to show pop-ups must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Default pop-up window setting" must be set to "Enabled" with the option value set to "Do not allow any site to show pop-ups". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for DefaultPopupsSetting is not set to "REG_DWORD = 2", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Default pop-up window setting" to "Enabled" with the option value set to "Do not allow any site to show pop-ups".
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The default search provider must be set to use an encrypted connection.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Manage Search Engines" must be configured. Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge Example REG_SZ value text for "ManagedSearchEngines": [{"allow_search_engine_discovery": false},{"is_default": true,"name": "Microsoft Bing","keyword": "bing","search_url": "https://www.bing.com/search?q={searchTerms}"},{"name": "Google","keyword": "google","search_url": "https://www.google.com/search?q={searchTerms}"}] If any of the search URLs in the list do not begin with "https", this is a finding.
Fix
Configure the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Manage Search Engines".
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Network prediction must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable network prediction" must be set to "Enabled" with the option value set to "Don't predict network actions on any network connection". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for NetworkPredictionOptions is not set to "REG_DWORD = 2", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable network prediction" to "Enabled" with the option value set to "Don't predict network actions on any network connection".
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Search suggestions must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable search suggestions" must be set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "SearchSuggestEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable search suggestions" to "Disabled".
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Importing of autofill form data must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of autofill form data" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportAutofillFormData" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of autofill form data" to "disabled".
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Importing of cookies must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of cookies" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportCookies" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of cookies" to "disabled".
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Importing of extensions must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of extensions" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportExtensions" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of extensions" to "disabled".
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Importing of browsing history must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of browsing history" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportHistory" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of browsing history" to "disabled".
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Importing of home page settings must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of home page settings" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportHomepage" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of home page settings" to "disabled".
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Importing of open tabs must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of open tabs" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportOpenTabs" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of open tabs" to "disabled".
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Importing of payment info must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of payment info" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportPaymentInfo" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of payment info" to "disabled".
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Importing of saved passwords must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of saved passwords" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportSavedPasswords" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of saved passwords" to "disabled".
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Importing of search engine settings must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of search engine settings" must be set to "disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportSearchEngine" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of search engine settings" to "disabled".
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Importing of shortcuts must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of shortcuts" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportShortcuts" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of shortcuts" to "disabled".
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AutoplayAllowed must be set to disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow media autoplay for websites" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "AutoplayAllowed" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow media autoplay for websites" to "disabled".
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WebUSB must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Control use of the WebUSB API" must be set to "enabled" with the option value set to "Do not allow any site to request access to USB devices via the WebUSB API". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "DefaultWebUsbGuardSetting" is not set to "REG_DWORD = 2", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Control use of the WebUSB API" to enabled" and select "Do not allow any site to request access to USB devices via the WebUSB API".
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Google Cast must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Cast/Enable Google Cast" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "EnableMediaRouter" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Cast/Enable Google Cast" to "disabled".
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Web Bluetooth API must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Control use of the Web Bluetooth API" must be set to "enabled" with the option value set to "Do not allow any site to request access to Bluetooth devices via the Web Bluetooth API". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "DefaultWebBluetoothGuardSetting" is not set to "REG_DWORD = 2", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Control use of the Web Bluetooth API" to "enabled" with the option value set to "Do not allow any site to request access to Bluetooth devices via the Web Bluetooth API.
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Autofill for Credit Cards must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable AutoFill for credit cards" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "AutofillCreditCardEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable AutoFill for credit cards" to "disabled".
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Autofill for addresses must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable AutoFill for addresses" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "AutofillAddressEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable AutoFill for addresses" to "disabled".
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Online revocation checks must be performed.
Maps to IA-5(2) via CCI-000185Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable online OCSP/CRL checks" 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 "EnableOnlineRevocationChecks" is not set to "REG_DWORD = 1", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable online OCSP/CRL checks" to "Enabled".
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Personalization of ads, search, and news by sending browsing history to Microsoft must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow personalization of ads, search and news by sending browsing history to Microsoft" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "PersonalizationReportingEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow personalization of ads, search and news by sending browsing history to Microsoft" to "disabled".
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Site tracking of a user’s location must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Default geolocation setting" must be set to "enabled" with the option value set to "Don't allow any site to track users' physical location". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "DefaultGeolocationSetting" is not set to "REG_DWORD = 2", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Default geolocation setting" to "enabled" and select "Don't allow any site to track users' physical location".
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Browser history must be saved.
Maps to AU-10 via CCI-000166Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable deleting browser and download history" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "AllowDeletingBrowserHistory" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable deleting browser and download history" to "disabled".
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Extensions installation must be blocklisted by default.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Extensions/Control which extensions cannot be installed" must be set to "Enabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge\ExtensionInstallBlocklist\1 If the value for "1" is not set to "REG_SZ = *", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Extensions/Control which extensions cannot be installed" to "Enabled". A list of blocklisted extensions may then be specified.
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The Password Manager must be disabled.
Maps to IA-5(13) via CCI-002007Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Password manager and protection/Enable saving passwords to the password manager" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "PasswordManagerEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Password manager and protection/Enable saving passwords to the password manager" to "disabled".
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Site isolation for every site must be enabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable site isolation for every site" 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 "SitePerProcess" is not set to "REG_DWORD = 1", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable site isolation for every site" to "enabled".
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Supported authentication schemes must be configured.
Maps to CM-7 via CCI-000382Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/HTTP authentication/Supported authentication schemes" must be set to "ntlm,negotiate". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "AuthSchemes" is not set to "REG_SZ = ntlm,negotiate", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/HTTP authentication/Supported authentication schemes" to "ntlm,negotiate".
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Microsoft Defender SmartScreen must be enabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure Microsoft Defender SmartScreen" 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 "SmartScreenEnabled" is not set to "REG_DWORD = 1", this is a finding. If this machine is on SIPRNet, this is Not Applicable.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure Microsoft Defender SmartScreen" to "Enabled".
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Microsoft Defender SmartScreen must be configured to block potentially unwanted apps.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure Microsoft Defender SmartScreen to block potentially unwanted apps" 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 SmartScreenPuaEnabled is not set to "REG_DWORD = 1", this is a finding. If this machine is on SIPRNet, this is Not Applicable.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure Microsoft Defender SmartScreen to block potentially unwanted apps" to "Enabled".
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Tracking of browsing activity must be disabled.
Maps to CM-7(3) via CCI-000388Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Block tracking of users' web-browsing activity" must be set to "Enabled" with the option value set to "Balanced" or "Strict". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "TrackingPrevention" is not set to "REG_DWORD = 2" or "REG_DWORD = 3", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Block tracking of users' web-browsing activity" to "Balanced" or "Strict".
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A website's ability to query for payment methods must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow websites to query for available payment methods" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for PaymentMethodQueryEnabled is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow websites to query for available payment methods" to "disabled".
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Suggestions of similar web pages in the event of a navigation error must be disabled.
Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Suggest similar pages when a webpage can't be found" must be set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for AlternateErrorPagesEnabled is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Suggest similar pages when a webpage can't be found" to "Disabled".
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User feedback must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow user feedback" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for UserFeedbackAllowed is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow user feedback" to "disabled".
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The collections feature must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable the Collections feature" must be set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "EdgeCollectionsEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable the Collections feature" to "Disabled".
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The Share Experience feature must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Configure the Share experience" must be set to "enabled" with the option value set to "Don't allow using the Share experience". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ConfigureShare" is not set to "REG_DWORD = 1", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Configure the Share experience" to "Don't allow using the Share experience".
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Guest mode must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable guest mode" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "BrowserGuestModeEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Enable guest mode" to "disabled".
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Relaunch notification must be required.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Notify a user that a browser restart is recommended or required for pending updates" must be set to "Enabled" with the option value set to "Required". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "RelaunchNotification" is not set to "REG_DWORD = 2", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Notify a user that a browser restart is recommended or required for pending updates" web-browsing activity to "Required".
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The built-in DNS client must be disabled.
Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Use built-in DNS client" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "BuiltInDnsClientEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Use built-in DNS client" to "disabled".
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Use of the QUIC protocol must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow QUIC protocol" must be set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "QuicAllowed" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow QUIC protocol" to "Disabled".
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Visual Search must be disabled.
Maps to CM-7 via CCI-000381Check
Verify the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Visual search enabled" is set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "VisualSearchEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Visual search enabled" to "Disabled".
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Copilot must be disabled.
Maps to CM-7 via CCI-000381Check
Verify the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Show Hubs Sidebar" is set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "HubsSidebarEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Show Hubs Sidebar" to "Disabled".
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Session only-based cookies must be enabled.
Maps to AU-10 via CCI-000166Check
Verify the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Configure cookies" is set to "Enabled" with the option value set to "Keep cookies for the duration of the session, except ones listed in 'SaveCookiesOnExit'". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for “DefaultCookiesSetting” is not set to "REG_DWORD = 4", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Configure cookies" to "Enabled" with the option value set to "Keep cookies for the duration of the session, except ones listed in 'SaveCookiesOnExit'".
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FriendlyURLs must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Configure the default paste format of URLs copied from Microsoft Edge and determine if additional formats will be available to users" must be set to "enabled" with the option value set to "The plain URL without any extra information, such as the page´s title. This is the recommended option when this policy is configured. For more information, see the description.". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ConfigureFriendlyURLFormat" is not set to "REG_DWORD = 1", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft EdgeConfigure the default paste format of URLs copied from Microsoft Edge, and determine if additional formats will be available to users" to "enabled" and select "The plain URL without any extra information, such as the page´s title. This is the recommended option when this policy is configured. For more information, see the description."
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Access to Microsoft 365 Copilot writing assistance must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Control access to Microsoft 365 Copilot writing assistance in Microsoft Edge for Business" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ComposeInlineEnabled" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Control access to Microsoft 365 Copilot writing assistance in Microsoft Edge for Business" to "disabled".
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Spell checking provided by Microsoft Editor must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Spell checking provided by Microsoft Editor" must be set to "Disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for MicrosoftEditorProofingEnabled is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Spell checking provided by Microsoft Editor" to "Disabled".
CAT III 10
Any vulnerability, the existence of which degrades measures to protect against loss of confidentiality, availability or integrity.
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User control of proxy settings must be disabled.
Maps to AC-4 via CCI-001414Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Proxy server/Proxy Settings" must be "Enabled", and have a "Proxy Settings" value defined for "ProxyMode". "ProxyMode" must be defined and set to one of the following: "direct", "system", "auto_detect", "fixed_servers", or "pac_script". Consult Microsoft documentation for proper configuration of the text string required to define the "Proxy Settings" value. Example: {"ProxyMode": "fixed_servers", "ProxyServer": "123.123.123.123:8080"} Values for "ProxyPacUrl", "ProxyServer", or "ProxyBypassList" are optional. Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the REG_SZ value for "ProxySettings" does not have "ProxyMode" configured, this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Proxy server/Proxy Settings" to "Enabled" and define a value for "ProxyMode". "ProxyMode" must be defined and set to one of the following: "direct", "system", "auto_detect", "fixed_servers", or "pac_script". Consult Microsoft documentation for proper configuration of the text string required to define the "Proxy Settings" value. Example: {"ProxyMode": "fixed_servers", "ProxyServer": "127.0.0.1:8080"} "ProxyPacUrl", "ProxyServer", or "ProxyBypassList" are optional.
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The list of domains for which Microsoft Defender SmartScreen will not trigger warnings must be allowlisted if used.
Maps to MA-3(2) via CCI-000870Check
If this machine is on SIPRNet, this is Not Applicable. This requirement for "SmartScreenAllowListDomains" is not required; this is optional. The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure the list of domains for which Microsoft Defender SmartScreen won't trigger warnings" may be set to "allow" for allowlisted domains. Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge SmartScreenAllowListDomains may be set as follows: HKLM\SOFTWARE\Policies\Microsoft\Edge\SmartScreenAllowListDomains\1 = mydomain.com HKLM\SOFTWARE\Policies\Microsoft\Edge\SmartScreenAllowListDomains\2 = myagency.mil If configured, the list of domains for which Microsoft Defender SmartScreen will not trigger warnings may be allowlisted.
Fix
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure the list of domains for which Microsoft Defender SmartScreen will not trigger warnings" may be set to "allow" for allowlisted domains.
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Data Synchronization must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Disable synchronization of data using Microsoft sync services" 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 "SyncDisabled" is not set to "REG_DWORD = 1", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Disable synchronization of data using Microsoft sync services" to "Enabled".
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Importing of browser settings must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of browser settings" must be set to "disabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "ImportBrowserSettings" is not set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow importing of browser settings" to "disabled".
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Edge development tools must be disabled.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Control where developer tools can be used" with the option value set to "Don't allow using the developer tools". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "DeveloperToolsAvailability" is not set to "REG_DWORD = 2", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Control where developer tools can be used" to "enabled" and select "Don't allow using the developer tools".
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Download restrictions must be configured.
Maps to CM-7 via CCI-000381Check
If this machine is on SIPRNet, this is Not Applicable. The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow download restrictions" must be set to "Enabled" with the option value set to "BlockDangerousDownloads", "Block potentially dangerous or unwanted downloads", or "BlockMaliciousDownloads". The more restrictive option, "Block all downloads", is also acceptable. Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge If the value for "DownloadRestrictions" is set to "REG_DWORD = 0", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow download restrictions" to "Enabled" and select one of the following: "BlockDangerousDownloads", "Block potentially dangerous or unwanted downloads", "BlockAllDownloads", or "BlockMaliciousDownloads".
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URLs must be allowlisted for plugin use if used.
Maps to CM-11(2) via CCI-003980, CCI-001812Check
This requirement for "Allow pop-up windows on specific sites" is not required; this is optional. The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Allow pop-up windows on specific sites" must be set to "Enabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge "PopupsAllowedForUrls" must be set as follows: HKLM\SOFTWARE\Policies\Microsoft\Edge\PopupsAllowedForUrls\1 = mydomain.com HKLM\SOFTWARE\Policies\Microsoft\Edge\PopupsAllowedForUrls\2 = myagency.mil If configured, the list of domains for which Microsoft Edge allows pop-ups may be allowlisted.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Content settings/Allow pop-up windows on specific sites" to "Enabled". A list of allowlisted URLs may be specified here.
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Extensions that are approved for use must be allowlisted if used.
Maps to CM-7(5) via CCI-001774Check
This requirement for "Allow specific extensions to be installed" is not required; this is optional. The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Extensions/Allow specific extensions to be installed" must be set to "Enabled". Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge "ExtensionInstallAllowlist" must be set as follows: HKLM\SOFTWARE\Policies\Microsoft\Edge\ExtensionInstallAllowlist\1 = "extension_id1" HKLM\SOFTWARE\Policies\Microsoft\Edge\ExtensionInstallAllowlist\2 = "extension_id2" If configured, the list of extensions for which Microsoft Edge allows to be installed may be allowlisted.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Extensions/Allow specific extensions to be installed" to "Enabled". A list of allowlisted extensions may then be specified.
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The download location prompt must be configured.
Maps to CM-7 via CCI-000381Check
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Ask where to save downloaded files" 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 "PromptForDownloadLocation" is not set to "REG_DWORD = 1", this is a finding.
Fix
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Ask where to save downloaded files" to "enabled".
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The list of domains media autoplay allows must be allowlisted if used.
Maps to CM-7 via CCI-000381Check
If this machine is on SIPRNet, this is Not Applicable. This requirement for "AutoplayAllowlist" is not required; this is optional. The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow media autoplay on specific sites" may be set to "allow" for allowlisted domains. Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge AutoplayAllowlist may be set as follows: HKLM\SOFTWARE\Policies\Microsoft\Edge\AutoplayAllowlist\1 = mydomain.com HKLM\SOFTWARE\Policies\Microsoft\Edge\AutoplayAllowlist\2 = myagency.mil If configured, the list of domains for which autoplay is allowed may be allowlisted.
Fix
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Allow media autoplay on specific sites" may be set to "allow" for allowlisted domains.