Exchange Server Archives

Winsage

June 11, 2026

Microsoft patches a record 206 flaws—and one is already being exploited

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

May 20, 2026

How To Mitigate The Microsoft Windows BitLocker ‘Angry Hacker’ 0-Day

Microsoft is addressing a zero-day exploit known as YellowKey, identified as CVE-2026-45585, which allows attackers to bypass BitLocker security using a specially crafted USB device. Following the release of exploit code by a hacker named Chaotic Eclipse, Microsoft has issued urgent mitigation advice. Cybersecurity expert Neena Sharma recommends treating this as an active threat and suggests implementing compensating controls, such as restricting USB boot access, until a patch is available. Microsoft has provided guidance for users to protect their systems, including the recommendation to add a PIN to BitLocker protection to reduce the risk of exploitation. Detailed instructions for adding a PIN are included in the advisory. YellowKey has not yet been exploited in the wild but requires physical access to the device.

Winsage

January 10, 2026

Microsoft Ends Support for Windows 11, Office 2021 in 2026: Upgrade Now

Microsoft will conclude support for several key products on October 14, 2026, including Windows 11 version 24H2 and Office 2021. This end-of-support wave also affects various Azure services, Exchange Server versions, and certain .NET frameworks. Organizations must evaluate migration costs and risks associated with operating unsupported products, as the lack of updates could lead to security vulnerabilities. Extended Security Updates (ESUs) will be available for select products but at a premium cost. Migration challenges include potential hardware incompatibilities and the need for custom solutions for legacy applications. Proactive planning, inventory assessments, and prioritizing critical systems for migration are recommended strategies. The transition aligns with Microsoft's vision of promoting cloud-based and AI-enhanced technologies. Economic implications include increased IT spending, particularly affecting small and medium enterprises.

Winsage

November 3, 2025

Microsoft Sounds Windows 11 And Server Update Failure Alarm

Microsoft has confirmed that users of Windows 11 and Windows Server are experiencing authentication failures due to updates released on or after August 29. This issue, detailed in Microsoft Support posting KB5070568, is linked to duplicate Security IDs (SIDs) on devices, affecting Windows 11 versions 24H2 and 25H2, as well as Windows Server 2025. The problem arises from new security protections that enforce checks on SIDs, which are necessary to maintain user account integrity and prevent unauthorized access. Duplicate SIDs typically result from unsupported cloning or duplication of a Windows installation without using the Sysprep tool. The recent update mandates SID uniqueness, blocking authentication handshakes between devices with duplicate SIDs. To resolve this, users must rebuild their devices using supported methods for cloning or duplicating a Windows installation to ensure unique SIDs.

Winsage

October 17, 2025

For October’s Patch Tuesday, a scary number of fixes

Microsoft has released an important update for SQL Server, designated as CVE-2025-59250, which addresses an issue with JDBC integration and requires a server reboot. Additionally, three updates for Microsoft Exchange Server have been issued: CVE-2025-53782, CVE-2025-59249, and CVE-2025-59248. Microsoft has also introduced six important updates for .NET and Visual Studio, including an update for Git (CVE-2025-54132) related to a bug in the Mermaid Diagram tool. Furthermore, Microsoft has released seven updates from various third-party vendors, including CERT/CC, Mitre, and GitHub, with Mitre and AMD advocating for CVE entries on behalf of open-source organizations to expedite patching.