Windows 11 security Archives

Winsage

May 19, 2026

Microsoft confirms patching issues in restricted Windows networks

Microsoft has issued a service alert indicating that customers in restricted network environments may encounter Windows Update failures, specifically error code 0x80010002, after installing the January 2026 optional non-security preview updates. Affected devices might download the February monthly Windows security update but could struggle with updates released in March and beyond due to changes in download timeout requirements. Microsoft is working on a resolution, and IT administrators can use Known Issue Rollback (KIR) as a workaround by configuring the appropriate Group Policy for their Windows version. A device restart is required to apply these settings. Historical issues include a bug fixed in April 2025 affecting WSUS installations and another issue resolved in August 2025 related to the Windows 11 24H2 cumulative update. Additionally, a KIR fix was provided for a known issue causing the May 2026 Windows 11 security update to fail with error code 0x800f0922.

Winsage

May 18, 2026

Microsoft confirms Windows 11 security update install issues

Microsoft has acknowledged a significant issue with the May 2026 Windows 11 security update, KB5089549, where users are encountering difficulties in installation, specifically the 0x800f0922 error code. This issue is primarily due to insufficient free space on the EFI System Partition (ESP), especially for devices with 10 MB or less available. The installation may fail during the reboot phase at around 35–36% completion, with users receiving notifications like "Something didn't go as planned. Undoing changes." Log entries may indicate insufficient ESP free space, such as "SpaceCheck: Insufficient free space" and "ServicingBootFiles failed. Error = 0x70." Microsoft recommends affected users utilize the Known Issue Rollback feature to reverse problematic updates and advises IT departments to install and configure the relevant Group Policy to address the issue.

Winsage

May 15, 2026

Microsoft confirms next Windows 11 update will “accelerate app launch and core shell experiences”

Microsoft will roll out Low Latency Profile enhancements for Windows 11 in the coming weeks, currently being tested in Release Preview builds. This feature optimizes CPU performance by temporarily boosting frequency during brief intervals, potentially improving app launch responsiveness by up to 40% and system flyouts by up to 70%. Preliminary tests indicate significant performance improvements, especially for users with lower-end hardware. The feature operates in the background and is not user-configurable. It will be included in an upcoming optional non-security preview update expected by the end of the month, followed by integration into the next monthly security patch on June 9. Updates will be rolled out in phases. These enhancements are part of Microsoft's Windows K2 initiative.

Winsage

May 13, 2026

Windows 11 security update fixes critical Bing and Azure flaws

Microsoft released its May 2026 Patch Tuesday updates for Windows 11, addressing 97 security vulnerabilities across various components, including Windows, Microsoft Office, Azure services, SQL Server, SharePoint, Hyper-V, and .NET. The updates are encapsulated in KB5089549 for Windows 11 versions 24H2 and 25H2, elevating systems to builds 26100.8457 and 26200.8457. Notable vulnerabilities include CVE-2026-32169, a critical flaw in Azure Cloud Shell with a CVSS score of 10.0, and CVE-2026-21536, a critical remote code execution vulnerability in the Microsoft Devices Pricing Program with a CVSS score of 9.8. Other critical vulnerabilities include CVE-2026-32191 and CVE-2026-32194, impacting Microsoft Bing Images, both with CVSS scores of 9.8. The update also addresses multiple Windows privilege escalation vulnerabilities and remote code execution vulnerabilities in Microsoft Office and Excel. Microsoft has warned of upcoming Secure Boot certificate expirations starting in June 2026 and has improved boot reliability related to BitLocker recovery issues. Users can install the updates via Settings → Windows Update, with a system restart required.

Winsage

May 7, 2026

My Windows 11 backup broke after KB5083769 — Microsoft says this simple fix might save your files

The Windows 11 security update KB5083769, released on April 14, 2026, introduces changes to the psmounterex.sys driver, causing compatibility issues with third-party backup solutions such as Macrium Reflect, Acronis Cyber Protect Cloud, UrBackup Server, and NinjaOne Backup. Microsoft states this is a necessary security adjustment, not a bug. The update also adds known vulnerable kernel drivers to a blocklist to enhance system security. Users can check if a driver is blocked by using the Event Viewer and looking for Event ID 3077 associated with a specific Policy ID.

Tech Optimizer

April 24, 2026

Microsoft Says You Don’t Need A Third-Party Antivirus App Anymore

Microsoft Defender Antivirus effectively addresses everyday security risks for many Windows 11 users without the need for additional software. It is active by default, integrated into the OS, and continuously updated. Windows 11 includes various security features, such as Microsoft Defender SmartScreen, Smart App Control, and Controlled Folder Access, which protect against unsafe links, untrusted applications, and unauthorized data modifications. Microsoft Defender scans files upon access and monitors system processes for threats, utilizing cloud capabilities to address emerging risks. While many users find Microsoft Defender adequate, experts note it may not meet everyone's needs, particularly in enterprise environments. Reviews have pointed out shortcomings, such as low phishing detection and inadequate ransomware protection, with a protection accuracy rating of 93 percent compared to some paid alternatives that achieved 100 percent.

Tech Optimizer

April 24, 2026

Is Microsoft defender enough to protect Windows?

The operating system on devices manages background tasks, with security being a key focus. Microsoft has improved Microsoft Defender, its pre-installed antivirus software, and now recommends it as a viable protection option for users. Microsoft Defender Antivirus is effective against everyday security risks for many Windows 11 users without needing additional software. It is deeply integrated into the operating system, continuously updated, and works alongside other security features to protect against hacking techniques, unsafe links, and untrusted applications. Microsoft Defender SmartScreen alerts users to suspicious content, while Smart App Control and Controlled Folder Access provide additional protections. Microsoft emphasizes the need to enable security features and keep devices updated. While many users find Defender adequate, experts note it has limitations, particularly in phishing detection and ransomware protection, with a protection accuracy rating of 93 percent, which is lower than some paid alternatives. For users handling sensitive tasks, a third-party antivirus solution is recommended for better protection.

Tech Optimizer

April 21, 2026

Microsoft quietly reveals whether you need a third-party antivirus software in Windows 11

Microsoft has stated that third-party antivirus software is not necessary for Windows 11, as its built-in antivirus solution, Windows Defender, is sufficient for most users. This assertion was made public on April 9, when Microsoft declared Windows 11 the most secure version of its operating system. Windows Defender is effective when users regularly install Security Intelligence Updates, apply monthly Patch Tuesday updates, and activate SmartScreen for filtering harmful downloads. While third-party antivirus solutions may be beneficial in certain scenarios, such as enterprise environments or for users seeking additional features, Microsoft advises relying on a single real-time antivirus solution, which is typically Windows Defender. Microsoft Defender is a comprehensive protection stack that includes real-time scanning, cloud-delivered protection, and automatic updates. Independent tests have shown that Microsoft Defender achieves high protection rates, comparable to leading paid antivirus solutions. The built-in Windows Security application includes features like SmartScreen, Smart App Control, and ransomware protection, providing extensive coverage without additional costs. The consensus is that most users will not need third-party antivirus software in 2026, as Windows Security offers robust protection against modern threats.

Tech Optimizer

April 8, 2026

AI malware threatens Windows 11 security. Traditional antivirus can’t keep up

AI-powered fileless malware poses a significant challenge to Windows 11 security, as traditional antivirus solutions struggle to detect these advanced threats. This type of malware operates without traditional files and can execute malicious actions directly in memory, bypassing conventional detection methods. Vulnerabilities in applications like Excel and Outlook have been exploited, allowing harmful code execution through simple actions like opening a preview pane. The integration of AI features, such as Microsoft's Copilot, has also created new risks, leading to potential data leaks. To combat these threats, a multi-layered security approach that includes behavioral analysis and real-time monitoring is essential. Upgrading from Windows 11 Home to Windows 11 Pro provides additional security features to enhance defenses against malware.

Winsage

March 30, 2026

Why Teams, OneDrive, and Windows 11 work better together on modern hardware

Microsoft Teams and OneDrive are integral to Windows 11, enhancing productivity and collaboration. To run Windows 11, a dedicated Trusted Platform Module (TPM) 2.0 chip is essential for security features like device attestation and secure key storage. TPM 2.0 enables seamless sign-ins via Windows Hello and ensures that only secure devices can access sensitive data in Teams and OneDrive. BitLocker, which also uses TPM 2.0, protects data on lost or stolen devices. Modern processors from Intel, AMD, and Qualcomm use hybrid architecture, optimizing performance by allocating specialized cores for demanding tasks and energy-efficient processes. This configuration improves video conferencing in Teams and file operations in OneDrive. NVMe SSDs are standard in Windows 11 PCs, providing low latency and high bandwidth that enhance responsiveness, boot times, and multitasking. Fast SSDs reduce wait times for file sharing in Teams. Many Windows 11 PCs are Copilot+ PCs, equipped with a Neural Processing Unit (NPU) that enhances on-device AI capabilities. The NPU improves real-time transcription in Teams and simplifies document searches in OneDrive. Modern GPUs manage animations and display settings in Windows 11, improving video call efficiency in Teams and enhancing thumbnail generation and video playback in OneDrive. The latest Wi-Fi standards, including Wi-Fi 6, Wi-Fi 6E, and Wi-Fi 7, provide enhanced security and reliability. They ensure low latency and high throughput for seamless video conferencing in Teams and faster uploads and downloads in OneDrive.