KB5099445: Overview with user sentiment and feedback

Overview

KB5099445 is a Monthly Rollup security update for Windows Server 2012 released on July 14, 2026. This cumulative update addresses multiple security vulnerabilities and quality improvements, including fixes for issues introduced in the June 2026 security update. The patch is part of the Extended Security Update (ESU) program for Windows Server 2012, which reached end-of-support on October 10, 2023.

General Purpose

• OLE Automation Fix: Resolves compatibility issues with COM method calls using BYREF parameters that share underlying storage, restoring application stability
• Distributed Key Manager (DKM) Hardening: Introduces automatic detection and opt-in remediation for insecure DKM container ACL configurations in AD FS environments
• Networking Security: Enforces TDI transport registration requirements to strengthen security posture
• Recycle Bin Correction: Fixes display of internal file names instead of original file names in deletion confirmation dialogs
• File Explorer Enhancement: Resolves OneDrive shortcut functionality when File Explorer runs in administrative mode
• Remote Desktop Security: Adds SHA-2 certificate thumbprint support for RDP publishers while maintaining SHA-1 backward compatibility

General Sentiment

The update addresses critical compatibility and security issues from the previous month's patch, demonstrating Microsoft's responsiveness to reported problems. The inclusion of fixes for previously known issues (OLE Automation, Recycle Bin, File Explorer) indicates active quality management. However, the introduction of new TDI transport enforcement may impact organizations using third-party network transports, requiring validation in test environments before broad deployment.

Known Issues

• Applications using unregistered third-party TDI transports may stop working after installation; registered transports are unaffected
• Installation may fail on Azure Arc-enabled devices unless ESU-specific network endpoints are properly configured
• Secure Boot certificate expiration beginning June 2026 may affect system boot capability if certificates are not updated in advance

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-08-17 01:15 PM

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