The first big Windows update of 2026 is a glitchy mess - heres the full list of bugs and fixes
Summary
Microsoft's January Patch Tuesday update aimed to fix 114 security vulnerabilities but introduced multiple new bugs across Windows and related apps. Affected areas include Remote Desktop authentication, Secure Launch shutdowns, classic Outlook freezes with PSTs on OneDrive, cloud file access errors, boot failures causing black screens, and app launch/license validation errors. Microsoft issued out-of-band emergency patches (e.g., KB5078127 and KB5073455) to address several issues, while some problems — notably a boot/unmountable volume issue — remain under investigation. The situation highlights recurring stability problems with Windows updates, where fixes for one set of issues have caused new regressions, increasing pressure on Microsoft to ensure update reliability.
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