Security update

Winsage
June 11, 2026
In the June 2026 Security Update for Windows 11 and Windows 10, Microsoft implemented a change that prevents custom folder icons and localized folder names from appearing if derived from an untrusted "desktop.ini" file. Users may initially perceive this as a bug, as folders may revert to default settings without user intervention. To maintain customizations, organizations should add trusted sources to the "Trusted Sites" list via Control Panel. Businesses can enable the "Allow the use of remote paths in file shortcut icons" policy through the Group Policy Editor, although this may reduce security. Users can also remove the Mark-of-the-Web tag from trusted "desktop.ini" files using PowerShell commands. This update reflects a broader trend of prioritizing security over customization in the operating system.
Winsage
June 11, 2026
Microsoft patched 206 vulnerabilities during June's Patch Tuesday, surpassing the previous record of 175 vulnerabilities patched in October 2025. Among the patched vulnerabilities, 118 are related to different versions of Windows, including Windows 10, Windows 11, and Windows Server. One critical vulnerability, CVE-2026-41091, in Microsoft Defender is actively being exploited, prompting an update to the Malware Protection Engine. Microsoft also addressed ten vulnerabilities in the Security Feature Bypass category due to the expiration of old Secure Boot certificates. Of the 118 Windows vulnerabilities, 19 are classified as critical Remote Code Execution (RCE) vulnerabilities, including CVE-2026-47288 and CVE-2026-47291. In Microsoft Office, 54 vulnerabilities were patched, including 25 RCE vulnerabilities, with nine classified as critical. Microsoft patched eight vulnerabilities in Exchange Server, including CVE-2026-45583, which can be exploited in a man-in-the-middle scenario. Additionally, the update for Edge addressed 74 Chromium vulnerabilities, including a zero-day vulnerability (CVE-2026-11645).
Winsage
June 11, 2026
Microsoft has resolved an issue affecting certain Windows Server 2025 devices that were booting into BitLocker recovery mode after the April 2026 security update. This issue was linked to specific BitLocker Group Policy configurations and required users to input their BitLocker recovery key upon the first restart after the update. However, this key would only need to be entered once for subsequent restarts, provided the group policy configuration remained unchanged. The problem primarily affected enterprise systems rather than personal devices. The issue arose under specific conditions: BitLocker was enabled on the operating system drive, a particular Group Policy was set, the Secure Boot State PCR7 Binding was "Not Possible," the Windows UEFI CA 2023 certificate was present, and the device was not already using the 2023-signed Windows Boot Manager. Microsoft released fixes in the KB5094125 and KB5093998 updates to address this problem, preventing devices with incompatible group policy configurations from installing the 2023-signed Windows Boot Manager. Event ID 1032 in the System event log indicates the issue when Windows updates are installed. For IT administrators unable to deploy the latest updates, it is recommended to remove the Group Policy configuration before installing updates or to implement a Known Issue Rollback (KIR) on affected devices. Additionally, Microsoft had previously addressed similar BitLocker recovery issues in August 2024 and May 2025.
Winsage
June 11, 2026
The June update for Windows 11, identified as KB5094126 (OS Builds 26200.8655 and 26100.8655), introduces significant enhancements and numerous bug fixes and security patches. A key feature is a low-latency profile that improves responsiveness of core system elements like the Start Menu and Search by allowing the CPU to quickly reach maximum clock speed upon user interaction. This update also refines the Start Menu, improves app launch speeds, and addresses longstanding issues such as faster downloads from the Windows Store and optimized Windows Search results. New features include multi-app camera support, Shared Audio functionality for streaming to multiple Bluetooth devices, and the ability to personalize user folder names during installation. Additionally, the update resolves 206 security vulnerabilities, including a critical kernel-level remote code execution vulnerability (CVE-2026-45657) with a threat score of 9.8.
Winsage
June 10, 2026
On June 9, 2026, Microsoft released a major security update addressing around 200 vulnerabilities, including three critical zero-day exploits. This update coincides with the expiration of Secure Boot certificates that have been in place since 2011. Users are advised to review their Windows 11 settings to ensure security and optimization during this transition. Key actions include installing the June update, enabling faster delivery of updates, turning on Core Isolation memory integrity, activating Controlled folder access against ransomware, confirming drive encryption, disabling the advertising ID, minimizing diagnostic data, auditing camera and microphone permissions, disabling unnecessary startup applications, enabling Storage Sense, adjusting power mode settings, and tuning visual effects for better performance.
Winsage
June 10, 2026
Microsoft has warned customers about potential installation complications with the latest monthly updates on certain Windows devices upgraded to Windows 11 versions 24H2 or 25H2. Users may encounter error codes 0x80073712 or 0x800f0993 when attempting to install cumulative updates for June 2026. Affected devices include a small fraction of those running Windows 10 versions 22H2 and 21H2, as well as Windows 11 version 23H2. Users may find that updates have failed, and the specified error codes will appear in the Windows Update log files. Microsoft plans to deploy a resolution for unmanaged enterprise devices and personal PCs after a system restart, with no new devices in these categories affected starting from May 19, 2026. For impacted devices, Microsoft has released specific updates as part of its June 2026 Patch Tuesday to prevent the issue. However, the problem will not be fixed for systems already upgraded to Windows 11 versions 24H2 or 25H2, and users are advised to remove the affected package using a command in an elevated Command Prompt. If this does not resolve the issue, users may need to perform a Windows 11 in-place upgrade. Microsoft has previously addressed similar challenges related to Windows update installations, including issues from the March 2026 non-security preview update and the January 2026 optional non-security preview updates.
Winsage
June 10, 2026
Microsoft has released the Windows 10 KB5094127 extended security update, which addresses vulnerabilities identified during the June 2026 Patch Tuesday and enhances monitoring of updated Secure Boot certificates. Users on Windows 10 Enterprise LTSC or enrolled in the ESU program can install it via the Windows Update settings. The update upgrades Windows 10 to build 19045.7417 and Windows 10 Enterprise LTSC 2021 to build 19044.7417. It focuses on security enhancements and bug fixes, resolving a total of 200 vulnerabilities, including three zero-day flaws. Key features include improved File Explorer search functionality for Chinese text and UTF-8 encoded files, dynamic status reporting for Secure Boot states, a new policy setting to limit Secure Boot service data sent to Microsoft, and enhanced targeting data for automatic receipt of new Secure Boot certificates. A known issue may cause BitLocker recovery notifications on certain systems, particularly those with specific BitLocker Group Policy settings. Microsoft recommends removing the Group Policy setting and suspending/resuming BitLocker as a temporary fix.
Winsage
June 1, 2026
Microsoft resolved an issue causing installation failures and error code 0x800f0922 during the deployment of the May 2026 Windows 11 security update (KB5089549), which was linked to insufficient free space on the EFI System Partition (ESP). The problem mainly affected devices with 10 MB or less available space, leading to automatic rollbacks of the update. The resolution was provided through the release of the Windows 11 KB5089573 preview cumulative update on May 26, 2026. Users installing updates released on or after this date will not need a workaround, while those with earlier updates can use the Known Issue Rollback feature. Additionally, IT administrators in enterprise settings can manually address the issue through Group Policy configurations. The KB5089573 update introduced 30 changes to improve performance and reliability.
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