Windows 11, version 26H2 security baseline
Update: The Windows 11, version 26H2 security baseline has been updated to reflect the general availability of Administrator protection. An updated v2 package is now available, and organizations should review and test the existing Administrator protection configuration as appropriate for their environment. You can download the baseline package from the Microsoft Security Compliance Toolkit, test the recommended configurations in your environment, and customize / implement them as appropriate. Summary of Changes This release includes several changes since the Security baseline for Windows 11, version 25H2 to further strengthen enterprise security and align the baseline with current platform capabilities and industry standards. Security Policy Change Summary Printer\Configure Windows Ready Print driver ranking Configured as “Enabled” to reduce reliance on third-party print drivers in the stack, narrowing the overall print driver attack surface. Internet Explorer\Internet Control Panel\Advanced Page\Turn off encryption support Updated from TLS 1.1 and TLS 1.2 to TLS 1.2 and TLS 1.3 to align with current security standards. User Account Control: Configure type of Admin Approval Mode (updated) Configured as “Admin Approval Mode with Administrator protection” to enable Administrator protection. User Account Control: Behavior of the elevation prompt for administrators running with Administrator protection (updated) Configured as “Prompt for credentials on the secure desktop” to require credential verification for administrative elevation. Windows Ready Print driver ranking Configure Windows Ready Print driver ranking" is the newly added setting under Administrative Templates\Printers to control whether Windows prefers the modern inbox IPP class driver over third-party OEM drivers when installing new printers. We recommend enabling this policy to reduce reliance on third-party print drivers in the stack, narrowing the overall print driver attack surface. Note that driver ranking applies when printers are installed via a connection method that supports IPP, such as USB or network multicast discovery. In those cases, if the printer supports IPP, Windows will install using the class driver even if a vendor V3/V4 driver is available. If the printer doesn't support IPP, or is installed directly as a TCP/IP printer, there's no change in behavior. Encryption Support We have updated the policy "Turn off encryption support" to allow only TLS 1.2 and TLS 1.3. Previous baseline releases permitted TLS 1.1 and TLS 1.2; however, TLS 1.1 is now considered obsolete and is no longer recommended for enterprise environments. This change aligns the security baseline with modern cryptographic standards while maintaining compatibility with widely deployed services that support current TLS versions. Administrator Protection (update) Administrator protection is now generally available. Organizations can enable it through Microsoft Intune or Group Policy. Important: Organizations should review and test their existing configuration and adjust these settings as appropriate for their environment. The security baselines for Windows 11, versions 24H2, 25H2, and 26H2 include settings that enable Administrator protection. The following policies are part of the security baseline: User Account Control: Configure type of Admin Approval Mode User Account Control: Behavior of the elevation prompt for administrators running with Administrator protection An updated v2 package has been published for Windows 11, version 26H2, to reflect this change. Please let us know your thoughts by commenting on this post or through the Security Baseline Community.Security Review for Microsoft Edge version 156
We have reviewed the new settings in Microsoft Edge version 156 and determined that there are no additional security settings that require enforcement. The Microsoft Edge version 151 security baseline remains our recommended configuration and can be downloaded from the Microsoft Security Compliance Toolkit. Microsoft Edge versions 153 through 156 introduced 8 new Computer and User settings. To make these settings easier to review, we have included a spreadsheet listing each of the new settings. As a reminder, the Microsoft Edge security baseline now aligns with the Extended Stable Channel, which provides major feature updates on an eight-week cadence while continuing to receive security and quality updates between releases. This provides organizations with additional time to evaluate and deploy feature changes while keeping security protections current. As always, all available settings for Microsoft Edge are documented here, and all available settings for Microsoft Edge Update are documented here. Please continue to share your feedback through the Security Baselines Discussion site or this post.Security Review for Microsoft Edge version 152
We have reviewed the new settings in Microsoft Edge version 152 and determined that there are no additional security settings that require enforcement. The Microsoft Edge version 151 security baseline continues to be our recommended configuration which can be downloaded from the Microsoft Security Compliance Toolkit. Microsoft Edge version 152 introduced 4 new Computer and User settings; we have included a spreadsheet listing the new settings to make it easier for you to find. Starting with version 152 Microsoft Edge is moving to a more frequent release cycle. To better align with the needs of the enterprise customers, the Microsoft Edge security baseline is expected to align with the Extended Stable Channel, which provides major feature updates on an eight-week cadence while continuing to receive security and quality updates between releases. This approach provides organizations with additional time to evaluate and deploy feature changes while ensuring security protections remain current. Why the change? Security baselines are intended to provide guidance for managing security relevant configuration settings, not to track every feature introduced in a browser release. With the move to a two-week release cadence, publishing baseline updates for every release would increase operational overhead while providing limited security benefit. The Extended Stable cadence offers a more practical balance for enterprise customers by allowing additional time for testing and evaluation, while continuing to receive security and critical fixes between major feature releases. By aligning with Extended Stable, we can update the baselines less frequently and focus on publishing them earlier in the release cycle, giving IT administrators more time to review and plan for upcoming changes. Our goal is to make security baseline adoption more predictable and easier to manage while continuing to provide timely security guidance. As a friendly reminder, all available settings for Microsoft Edge are documented here, and all available settings for Microsoft Edge Update are documented here. Please continue to give us feedback through the Security Baselines Discussion site or this post.Security baseline for Microsoft Edge version 151
We are pleased to announce the enterprise-ready release of the security baseline for Microsoft Edge version 151! We have reviewed the settings in Microsoft Edge version 151 and updated our guidance with six new recommendations. We have also identified one additional setting that organizations should consider evaluating in their environments. A new Microsoft Edge security baseline package was just released to the Download Center. You can download the new package from the Security Compliance Toolkit. Enable Process Isolation (added) We are enforcing ‘Enable Process Isolation’ to help protect Microsoft Edge from unauthorized access, modification, and tampering by other applications running on the device. This setting strengthens browser process integrity and helps safeguard sensitive data used by Microsoft Edge. Organizations that encounter compatibility issues with software that depends on browser process injection should treat such configurations as exceptions requiring explicit risk acceptance and compatibility validation. Enable renderer in app container (added) We are enforcing the default and enabling ‘Enable renderer in app container’ to strengthen Microsoft Edge’s browser isolation protections by ensuring renderer processes run within the additional restrictions provided by AppContainer. This helps reduce the impact of browser-based attacks and limits the ability of exploited renderer processes to interact with system resources. Organizations that require this setting to be disabled due to incompatible software should treat such configurations as exceptions that require explicit risk acceptance. Enable the network service sandbox (added) We are enforcing the default and enabling ‘Enable the network service sandbox’ to ensure Microsoft Edge network-facing processes operate within sandbox isolation boundaries that help reduce the impact of exploitation and limit access to system resources. Because disabling the network service sandbox weakens a core browser security protection, organizations should treat any requirement to disable this setting as an exception scenario requiring explicit risk acceptance and compatibility validation. Configure browser process code integrity guard (added) We are enabling ‘Configure browser process code integrity guard setting’ with a value of ‘Enable code integrity guard enforcement in the browser process’. The setting strengthens protections against unauthorized code injection into Microsoft Edge browser processes. Some enterprise applications, extensions, accessibility tools, or security products may still rely on legacy injection techniques and require compatibility validation. We encourage organizations to fully test this setting in their environments and work with vendors to identify or remediate incompatible software. Enable Application Bound Encryption (added) We are enabling ‘Enable Application Bound Encryption’ to strengthen protections for browser-stored credentials, authentication tokens, and other sensitive data by binding encryption more closely to the browser process. This helps reduce the risk of unauthorized access to protected browser data by malware or other untrusted software. Because disabling this setting weakens an important protection boundary, organizations should treat any requirement to disable the feature as an exception requiring explicit risk review. Enhance the security state in Microsoft Edge (added) We are enabling ‘Enhance the security state in Microsoft Edge’ and configuring the setting to Balanced to provide additional protection against modern web-based attacks while maintaining compatibility for most enterprise users. In Balanced mode, Microsoft Edge applies additional mitigations such as disabling just-in-time (JIT) JavaScript compilation and enabling added operating system protections on processes used to load sites that users do not frequently visit, helping reduce the risk of memory-related vulnerabilities. Because these protections can introduce compatibility issues for some applications or workflows, organizations should validate critical business sites and applications during their normal testing process prior to broad deployment and configure exceptions as needed. Additional details can be found here. Configure Automatic HTTPS (worth considering) We previously released a blog discussing a new feature called Automatic HTTPS. This setting can automatically switch your connections to websites from HTTP to HTTPS on sites that are highly likely to support the more secure protocol. This option helps ensure that users' network traffic is more secure and less susceptible to SSL stripping attacks. The best part, the end user doesn’t get prompted, it just works! This new feature has two configuration options: Navigations delivered over HTTP are switched to HTTPS’ (UpgradeCapableDomains) and ‘All navigation delivered over HTTP are switched to HTTPS’ (AlwaysUpgrade). There are trade-offs for each configuration: the UpgradeCapableDomains option only upgrades to HTTPS if Microsoft believes the site is likely to work over HTTPS, and this setting is unavailable if you’ve disabled the ComponentUpdatesEnabled policy. The more secure AlwaysUpgrade option unconditionally updates all HTTP requests to HTTPS, which will result in a user-visible error page if the target site does not support HTTPS. We encourage organizations to consider implementing and testing Automatic HTTPS within their environment. Collectively, these changes continue our focus on strengthening browser isolation, sandboxing, process integrity, and protection of sensitive browser data while balancing enterprise compatibility requirements. Microsoft Edge version 151 introduced 4 new computer and user settings. We have included a spreadsheet listing the new settings in the release to make it easier for you to find them. As a friendly reminder, all available settings for Microsoft Edge are documented here, and all available settings for Microsoft Edge Update are documented here. Please continue to give us feedback through the Security Baseline Community or in comments on this post.Security Review for Microsoft Edge version 150
We have reviewed the new settings in Microsoft Edge version 150 and determined that there are no additional security settings that require enforcement. The Microsoft Edge version 139 security baseline continues to be our recommended configuration which can be downloaded from the Microsoft Security Compliance Toolkit. Microsoft Edge version 150 introduced 8 new Computer and User settings; we have included a spreadsheet listing the new settings to make it easier for you to find. As a friendly reminder, all available settings for Microsoft Edge are documented here, and all available settings for Microsoft Edge Update are documented here. Please continue to give us feedback through the Security Baselines Discussion site or this post.
Dynamic Code Setting in Version 139 Causing Printing Issues
Microsoft Edge security baseline version 139 via Intune sets the Dynamic Code value to 'Prevent the browser process from creating dynamic code'. The setting causes Microsoft Edge to close down / crash when trying to print. Reverting the setting value back to version 128 'Default dynamic code settings' resolves Microsoft Edge not closing down when trying to print.
RestrictedTrafficInstall.ps1 Fails on Windows 10 IoT Enterprise LTSC 2021 with SKU Detection Error
I am encountering an issue while deploying the Restricted Traffic Limited Functionality Baseline on a Windows 10 IoT Enterprise LTSC 2021 device and would like to confirm whether this OS edition is supported or if this is a known issue with the baseline script. Operating System: Windows 10 IoT Enterprise LTSC 2021 EditionID: IoTEnterpriseS DisplayVersion: 21H2 : ...\RestrictedTrafficInstall.ps1 : Could not get SKU of current running OS. CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,RestrictedTrafficInstall.ps1Windows 11 24H2 Sec Baseline → Broken SSO to on‑prem (Root cause: PKINIT SHA‑1 baseline)
Hi all, I ran into an issue with Entra-joined devices using Windows Hello for Business (Cloud Kerberos Trust) that might help others working with Windows 11 24H2 security baselines. Scenario Windows 11 25H2 devices Entra-joined (not hybrid) Intune-managed Windows Hello for Business (WHfB) enabled Cloud Kerberos Trust configured On-prem AD (Windows Server 2019/2022 DCs) Access to SMB shares / on-prem applications Symptoms SSO to on-prem resources fails Users get credential/PIN prompt instead of SSO Error message: “The system cannot contact a domain controller to service the authentication request” Client-side observations: klist → no tickets (initially) After enabling Cloud Kerberos Trust: klist get krbtgt → works klist get cifs/server.domain → fails Error: 0xc000a100 / 0x3bc4 Hash generation for the specified version and hash type is not enabled on server Root Cause The issue was caused by a Windows 11 24H2 security baseline setting related to Kerberos/PKINIT. The 24H2 baseline introduces a policy for configuring hash algorithms for certificate-based Kerberos authentication (PKINIT). This setting allows environments to disable SHA-1 and require SHA-2 algorithms. [applepie.se] Important detail: This configuration only works if the domain controllers fully support PKINIT with SHA-2, which effectively requires Windows Server 2025 domain controllers across the environment. If SHA-1 is disabled while running: Windows Server 2019 or 2022 DCs Mixed environments then PKINIT authentication fails, which directly impacts: Windows Hello for Business Cloud Kerberos Trust Any passwordless Kerberos-based authentication Why this is difficult to troubleshoot Cloud Kerberos Trust appears correctly configured AzureADKerberos object exists PRT is valid Network connectivity is fine However: Kerberos tickets are not issued correctly Service tickets (CIFS, HTTP, etc.) fail Errors are misleading and point to KDC/hash issues No explicit warning is provided in baseline guidance that mixed environments will break Resolution Revert the baseline change and allow SHA-1 for PKINIT again. Policy location: Computer Configuration → System → Kerberos / KDC → Configure hash algorithms for certificate logon Ensure: SHA-1 is set to Allowed/Default After reverting: Kerberos ticket issuance works SSO to on-prem resources is restored Recommendation Do not disable SHA-1 for PKINIT unless: All domain controllers are Windows Server 2025, and PKINIT SHA-2 support has been fully validated Treat this setting as future hardening, not production-safe for mixed environments today. Takeaway If you experience: WHfB + Cloud Kerberos Trust SSO failures klist get errors with hash generation issues Missing or failing Kerberos service tickets check the PKINIT hash configuration from the 24H2 security baseline first.Security baseline for Windows Server 2025, version 2602
Microsoft is pleased to announce the February 2026 Revision (v2602) of the security baseline package for Windows Server 2025! You can download the baseline package from the Microsoft Security Compliance Toolkit, test the recommended configurations in your environment, and customize / implement them as appropriate. Summary of Changes in This Release This release includes several changes made since the Security baseline for Windows Server 2025, version 2506 to further assist in the security of enterprise customers along with better aligning with the latest capabilities and standards. The changes include what is now depicted in the table below. Security Policy Change Summary Configure the behavior of the sudo command Configured as Enabled: Disabled on both MS and DC Configure Validation of ROCA-vulnerable WHfB keys during authentication Configured as Enabled: Block on DC to block Windows Hello for Business (WHfB) keys that are vulnerable to the Return of Coppersmith's attack (ROCA) Disable Internet Explorer 11 Launch Via COM Automation Configured as Enabled to prevent legacy scripts and applications from programmatically launching Internet Explorer 11 using COM automation interfaces Do not apply the Mark of the Web tag to files copied from insecure sources Configured as Disabled on both MS and DC Network security: Restrict NTLM: Audit Incoming NTLM Traffic Configured as Enable auditing for all accounts on both MS and DC Network security: Restrict NTLM: Audit NTLM authentication in this domain Configured as Enable all on DC Network security: Restrict NTLM: Outgoing NTLM traffic to remote servers Configured as Audit all on both MS and DC NTLM Auditing Enhancements Already enabled by default to improve visibility into NTLM usage within your environment Prevent downloading of enclosures Remove from the baseline as it is not applicable for Windows Server 2025. It depends on IE – RSS feed Printer: Configure RPC connection settings Enforce the default, RPC over TCP with Authentication Enabled, on both MS and DC Printer: Configure RPC listener settings Configure as RPC over TCP | Kerberos on MS Printer: Impersonate a client after authentication Add RESTRICTED SERVICES\PrintSpoolerService to allow the Print Spooler’s restricted service identity to impersonate clients securely Configure the behavior of the sudo command Sudo for Windows can be used as a potential escalation of privilege vector when enabled in certain configurations. It may allow attackers or malicious insiders to run commands with elevated privileges, bypassing traditional UAC prompts. This is especially concerning in environments with Active Directory or domain controllers. We recommend to configuring the policy Configure the behavior of the sudo command (System) as Enabled with the maximum allowed sudo mode as Disabled to prevent the sudo command from being used. Configure Validation of ROCA-vulnerable WHfB keys during authentication To mitigate Windows Hello for Business (WHfB) keys that are vulnerable to the Return of Coppersmith's attack (ROCA), we recommend enabling the setting Configure Validation of ROCA-vulnerable WHfB keys during authentication (System\Security Account Manager) in a Block mode in domain controllers. To ensure there are no incompatible devices/orphaned/vulnerable keys in use that will break when blocked, please see Using WHfBTools PowerShell module for cleaning up orphaned Windows Hello for Business Keys - Microsoft Support. Note: A reboot is not required for changes to this setting to take effect. Disable Internet Explorer 11 Launch Via COM Automation Similar to the Windows 11 version 25H2 security baseline, we recommend disabling Internet Explorer 11 Launch Via COM Automation (Windows Components\Internet Explorer) to prevent legacy scripts and applications from programmatically launching Internet Explorer 11 using COM automation interfaces such as CreateObject("InternetExplorer.Application"). Allowing such behavior poses a significant risk by exposing systems to the legacy MSHTML and ActiveX components, which are vulnerable to exploitation. Do not apply the Mark of the Web tag to files copied from insecure sources We have included the setting Do not apply the Mark of the Web tag to files copied from insecure sources (Windows Components\File Explorer) configured as Disabled, which is consistent with Windows 11 security baseline. When this configuration is set to Disabled, Windows applies the Mark of the Web (MotW) tag to files copied from locations classified as Internet or other untrusted zones. This tag helps enforce additional protections such as SmartScreen checks and Office macro blocking, reducing the risk of malicious content execution. NTLM Auditing As part of our ongoing effort to help customers transition away from NTLM and adopt Kerberos for a more secure environment, we introduce new recommendations to strengthen monitoring and prepare for future NTLM restrictions on Windows Server 2025. Configure Network security: Restrict NTLM: Audit Incoming NTLM Traffic (Security Options) to Enable auditing for all accounts on both member servers and domain controllers. When enabled, the server logs events for all NTLM authentication requests that would be blocked once incoming NTLM traffic restrictions are enforced. Configure Network security: Restrict NTLM: Audit NTLM authentication in this domain (Security Options) to Enable all on domain controllers. This setting logs NTLM pass-through authentication requests from servers and accounts that would be denied when NTLM authentication restrictions are applied at the domain level. Configure Outgoing NTLM traffic to remote servers (Security Options) to Audit all on both member servers and domain controllers to log an event for each NTLM authentication request sent to a remote server, helping identify servers that still receive NTLM traffic. In addition, there are two new NTLM auditing capabilities enabled by default that were recently introduced in Windows Server 2025 and Windows 11 version 25H2. These enhancements provide detailed audit logs to help security teams monitor and investigate authentication activity, identify insecure practices, and prepare for future NTLM restrictions. Since these auditing improvements are enabled by default, no additional configuration is required, and thus the baseline does not explicitly enforce them. For more details, see Overview of NTLM auditing enhancements in Windows 11 and Windows Server 2025. Prevent Downloading of Enclosures The policy Prevent downloading of enclosures (Windows Components\RSS Feeds) has been removed from the Windows Server 2025 security baseline. This setting is not applicable to Windows Server 2025 because it depends on Internet Explorer functionality for RSS feeds. Printer security enhancements There are two new policies in Windows Server 2025 designed to significantly improve security posture of printers: Require IPPS for IPP printers (Printers) Set TLS/SSL security policy for IPP printers (Printers) Enabling these policies may cause operational challenges in environments that still rely on IPP or use self-signed or locally issued certificates. For this reason, these policies are not ter enforced in the Windows Server 2025 security baseline. However, we do recommend customers transition out of IPP or self-signed certificates and restricting them for a more secure environment. In addition, there are some changes to printer security Added RESTRICTED SERVICES\PrintSpoolerServiceto the Impersonate a client after authentication (User Rights Assignments) policy for both member servers and domain controllers, consistent with security baseline for Windows 11 version 25H2. Enforced the default setting for Configure RPC connection settings (Printers) to always use RPC over TCP with Authentication Enabled on both member servers and domain controllers. This prevents misconfiguration that could introduce security risks. Raised the security bar of the policy Configure RPC listener settings (Printers) from Negotiate (default) to Kerberos on member servers. This change encourages customers to move away from NTLM and adopt Kerberos for a more secure environment. Secure Boot certificate update To help organizations deploy, manage, and monitor the Secure Boot certificate update, Windows includes several policy settings under Administrative Templates\Windows Components\Secure Boot. These settings are deployment controls and aids. Enable Secure Boot Certificate Deployment allows an organization to explicitly initiate certificate deployment on a device. When enabled, Windows begins the Secure Boot certificate update process the next time the Secure Boot task runs. This setting does not override firmware compatibility checks or force updates onto unsupported devices. Automatic Certificate Deployment via Updates controls whether Secure Boot certificate updates are applied automatically through monthly Windows security and non‑security updates. By default, devices that Microsoft has identified as capable of safely applying the updates will receive and apply them automatically as part of cumulative servicing. If this setting is disabled, automatic deployment is blocked and certificate updates must be initiated through other supported deployment methods. Certificate Deployment via Controlled Feature Rollout allows organizations to opt devices into a Microsoft‑managed Controlled Feature Rollout for Secure Boot certificate updates. When enabled, Microsoft assists with coordinating deployment across enrolled devices to reduce risk during rollout. Devices participating in a Controlled Feature Rollout must have diagnostic data enabled. Devices that are not enrolled will not participate. Secure Boot certificate updates depend on device firmware support. Some devices have known firmware limitations that can prevent updates from being applied safely. Organizations should test representative hardware, monitor Secure Boot event logs, and consult the deployment guidance at https://aka.ms/GetSecureBoot for detailed recommendations and troubleshooting information. SMB Server hardening feature SMB Server has been susceptible to relay attacks (e.g., CVE-2025-55234), and Microsoft has released multiple features to protect against the relay attacks including SMB Server signing, which can be enabled with the setting of Microsoft network server: Digitally sign communications (always) (Security Option) SMB Server extended protection for authentication (EPA), which can be enabled with the setting of Microsoft network server: Server SPN target name validation level (Security Option) To further support customers to adopt these SMB Server hardening features, in the September 2025 Security Updates, Microsoft has released support for Audit events, across all supported in-market platforms, to audit SMB client compatibility for SMB Server signing as well as SMB Server EPA. These audit capabilities can be controlled via the two policies located at Network\Lanman Server Audit client does not support signing Audit SMB client SPN support This allows you to identify any potential device or software incompatibility issues before deploying the hardening measures that are already supported by SMB Server. Our recommendation is For domain controllers, the SMB signing is already enabled by default so there is no action needed for hardening purposes. For member servers, first enabling the two new audit features to assess the environment and then decide whether SMB Server Signing or EPA should be used to mitigate the attack vector. Please let us know your thoughts by commenting on this post or through the Security Baseline Community.Windows 11, version 25H2 security baseline
Microsoft is pleased to announce the security baseline package for Windows 11, version 25H2! You can download the baseline package from the Microsoft Security Compliance Toolkit, test the recommended configurations in your environment, and customize / implement them as appropriate. Summary of changes This release includes several changes made since the Windows 11, version 24H2 security baseline to further assist in the security of enterprise customers, to include better alignment with the latest capabilities and standards. The changes include what is depicted in the table below. Security Policy Change Summary Printer: Impersonate a client after authentication Add “RESTRICTED SERVICES\PrintSpoolerService” to allow the Print Spooler’s restricted service identity to impersonate clients securely NTLM Auditing Enhancements Enable by default to improve visibility into NTLM usage within your environment MDAV: Attack Surface Reduction (ASR) Add "Block process creations originating from PSExec and WMI commands" (d1e49aac-8f56-4280-b9ba-993a6d77406c) with a recommended value of 2 (Audit) to improve visibility into suspicious activity MDAV: Control whether exclusions are visible to local users Move to Not Configured as it is overridden by the parent setting MDAV: Scan packed executables Remove from the baseline because the setting is no longer functional - Windows always scans packed executables by default Network: Configure NetBIOS settings Disable NetBIOS name resolution on all network adapters to reduce legacy protocol exposure Disable Internet Explorer 11 Launch Via COM Automation Disable to prevent legacy scripts and applications from programmatically launching Internet Explorer 11 using COM automation interfaces Include command line in process creation events Enable to improve visibility into how processes are executed across the system WDigest Authentication Remove from the baseline because the setting is obsolete - WDigest is disabled by default and no longer needed in modern Windows environments Printer Improving Print Security with IPPS and Certificate Validation To enhance the security of network printing, Windows introduces two new policies focused on controlling the use of IPP (Internet Printing Protocol) printers and enforcing encrypted communications. The setting, "Require IPPS for IPP printers", (Administrative Templates\Printers) determines whether printers that do not support TLS are allowed to be installed. When this policy is disabled (default), both IPP and IPPS transport printers can be installed - although IPPS is preferred when both are available. When enabled, only IPPS printers will be installed; attempts to install non-compliant printers will fail and generate an event in the Application log, indicating that installation was blocked by policy. The second policy, "Set TLS/SSL security policy for IPP printers" (same policy path) requires that printers present valid and trusted TLS/SSL certificates before connections can be established. Enabling this policy defends against spoofed or unauthorized printers, reducing the risk of credential theft or redirection of sensitive print jobs. While these policies significantly improve security posture, enabling them may introduce operational challenges in environments where IPP and self-signed or locally issued certificates are still commonly used. For this reason, neither policy is enforced in the security baseline, at this time. We recommend that you assess your printers, and if they meet the requirements, consider enabling those policies with a remediation plan to address any non-compliant printers in a controlled and predictable manner. User Rights Assignment Update: Impersonate a client after authentication We have added RESTRICTED SERVICES\PrintSpoolerService in the “Impersonate a client after authentication” User Rights Assignment policy. The baseline already includes Administrators, SERVICE, LOCAL SERVICE, and NETWORK SERVICE for this user right. Adding the restricted Print Spooler supports Microsoft’s ongoing effort to apply least privilege to system services. It enables Print Spooler to securely impersonate user tokens in modern print scenarios using a scoped, restricted service identity. Although this identity is associated with functionality introduced as part of Windows Protected Print (WPP), it is required to support proper print operations even if WPP is not currently enabled. The system manifests the identity by default, and its presence ensures forward compatibility with WPP-based printing. Note: This account may appear as a raw SID (e.g., S-1-5-99-...) in Group Policy or local policy tools before the service is fully initialized. This is expected and does not indicate a misconfiguration. Warning: Removing this entry will result in print failures in environments where WPP is enabled. We recommend retaining this entry in any custom security configuration that defines this user right. NTLM Auditing Enhancements Windows 11, version 25H2 includes enhanced NTLM auditing capabilities, enabled by default, which significantly improves visibility into NTLM usage within your environment. These enhancements provide detailed audit logs to help security teams monitor and investigate authentication activity, identify insecure practices, and prepare for future NTLM restrictions. Since these auditing improvements are enabled by default, no additional configuration is required, and thus the baseline does not explicitly enforce them. For more details, see Overview of NTLM auditing enhancements in Windows 11 and Windows Server 2025. Microsoft Defender Antivirus Attack Surface Reduction (ASR) In this release, we've updated the Attack Surface Reduction (ASR) rules to add the policy Block process creations originating from PSExec and WMI commands (d1e49aac-8f56-4280-b9ba-993a6d77406c) with a recommended value of 2 (Audit). By auditing this rule, you can gain essential visibility into potential privilege escalation attempts via tools such as PSExec or persistence mechanisms using WMI. This enhancement helps organizations proactively identify suspicious activities without impacting legitimate administrative workflows. Control whether exclusions are visible to local users We have removed the configuration for the policy "Control whether exclusions are visible to local users" (Windows Components\Microsoft Defender Antivirus) from the baseline in this release. This change was made because the parent policy "Control whether or not exclusions are visible to Local Admins" is already set to Enabled, which takes precedence and effectively overrides the behavior of the former setting. As a result, explicitly configuring the child policy is unnecessary. You can continue to manage exclusion visibility through the parent policy, which provides the intended control over whether local administrators can view exclusion lists. Scan packed executables The “Scan packed executables” setting (Windows Components\Microsoft Defender Antivirus\Scan) has been removed from the security baseline because it is no longer functional in modern Windows releases. Microsoft Defender Antivirus always scans packed executables by default, therefore configuring this policy has no effect on the system. Disable NetBIOS Name Resolution on All Networks In this release, we start disabling NetBIOS name resolution on all network adapters in the security baseline, including those connected to private and domain networks. The change is reflected in the policy setting “Configure NetBIOS settings” (Network\DNS Client). We are trying to eliminate the legacy name resolution protocol that is vulnerable to spoofing and credential theft. NetBIOS is no longer needed in modern environments where DNS is fully deployed and supported. To mitigate potential compatibility issues, you should ensure that all internal systems and applications use DNS for name resolution. We recommend the following; test critical workflows in a staging environment prior to deployment, monitor for any resolution failures or fallback behavior, and inform support staff of the change to assist with troubleshooting as needed. This update aligns with our broader efforts to phase out legacy protocols and improve security. Disable Internet Explorer 11 Launch Via COM Automation To enhance the security posture of enterprise environments, we recommend disabling Internet Explorer 11 Launch Via COM Automation (Windows Components\Internet Explorer) to prevent legacy scripts and applications from programmatically launching Internet Explorer 11 using COM automation interfaces such as CreateObject("InternetExplorer.Application"). Allowing such behavior poses a significant risk by exposing systems to the legacy MSHTML and ActiveX components, which are vulnerable to exploitation. Include command line in process creation events We have enabled the setting "Include command line in process creation events" (System\Audit Process Creation) in the baseline to improve visibility into how processes are executed across the system. Capturing command-line arguments allows defenders to detect and investigate malicious activity that may otherwise appear legitimate, such as abuse of scripting engines, credential theft tools, or obfuscated payloads using native binaries. This setting supports modern threat detection techniques with minimal performance overhead and is highly recommended. WDigest Authentication We removed the policy "WDigest Authentication (disabling may require KB2871997)" from the security baseline because it is no longer necessary for Windows. This policy was originally enforced to prevent WDigest from storing user’s plaintext passwords in memory, which posed a serious credential theft risk. However, starting with 24H2 update, the engineering teams deprecated this policy. As a result, there is no longer a need to explicitly enforce this setting, and the policy has been removed from the baseline to reflect the current default behavior. Since the setting does not write to the normal policies location in the registry it will not be cleaned up automatically for any existing deployments. Please let us know your thoughts by commenting on this post or through the Security Baseline Community.
