Patch Tuesday
The latest Patch Tuesday coverage — news, analysis, and updates from the WindowsNews.AI desk.
Microsoft Confirms KB5079473 Update Blocks Microsoft Account Logins in Teams, OneDrive, Edge
Microsoft has officially confirmed that security update KB5079473 contains a critical bug that breaks Microsoft account sign-ins across multiple applications in Windows 11 versions 24H2 and 25H2. The...
KB5037771 breaks OneDrive, Office, and Copilot logins in Windows 11.
Microsoft's Windows 11 update KB5037771, released in late May 2024, has triggered widespread authentication failures across Microsoft's own ecosystem. Users report being unable to sign into their...
KB5079473 Breaks Windows 11 Sign-in: Microsoft Confirms Workaround, Users Report Widespread Issues
Microsoft's KB5079473 cumulative update for Windows 11 is causing sign-in failures for users with Microsoft accounts, forcing many to rely on a restart workaround to access their systems. The company...
KB5079473 Update Breaks Microsoft Account Sign-In on Windows 11 25H2
Microsoft's March 2026 Patch Tuesday update KB5079473 has triggered widespread Microsoft Account sign-in failures across Windows 11 25H2 systems. The company acknowledged the issue in a support...
Windows 11 C Drive Access Denied After February 2026 Update: Microsoft and Samsung Investigate Critical Bug
Microsoft and Samsung have launched a joint investigation into a critical Windows 11 bug that has left users unable to access their C: system drives following recent cumulative updates. The issue,...
Samsung’s Galaxy Connect App Triggers Windows 11 ‘Access Denied’ Errors on C: Drive
A flaw in Samsung’s Galaxy Connect application is locking Windows 11 users out of their own C: drive, displaying an ‘Access Denied’ error that renders the PC nearly unusable. The problem...
Galaxy Connect Bug Blocks C: Drive Access on Windows 11 Galaxy Book 4 Systems
Microsoft and Samsung have confirmed that a buggy version of the Samsung Galaxy Connect application caused widespread C: drive access issues on Galaxy Book 4 laptops and some desktop systems. The...
KB5079473 triggers BSOD crashes, forcing Microsoft to advise uninstall.
Microsoft's March 2026 Patch Tuesday update for Windows 11, KB5079473, has triggered widespread reports of system crashes, boot failures, and application instability. Released on March 10, 2026, this...
Samsung Galaxy Book App, Not Windows 11 Update, Disables C Drive Access
Microsoft has confirmed that the March 2026 cumulative update for Windows 11 (KB5079473) is not responsible for the widespread reports of C drive access failures affecting users. The company's...
Microsoft Deploying Silent Hotpatch KB5084597 for Critical RRAS RCE Vulnerabilities
Microsoft has quietly deployed an out-of-band hotpatch, KB5084597, in mid-March 2026 to address multiple critical remote code execution vulnerabilities in the Windows Routing and Remote Access...
Windows 11 KB5079473 March Update Causes System Instability: User Reports & Microsoft's Response
Microsoft's March 2026 cumulative update KB5079473, released on March 10, has triggered widespread reports of system instability across Windows 11 installations. The update, part of Microsoft's...
March 2026 Patch Tuesday: Office, Azure Arc MCP, and AI Agents Expand Attack Surface
Microsoft's March 2026 Patch Tuesday reveals a security landscape where traditional software vulnerabilities intersect with cloud infrastructure and emerging AI components. The update addresses 78...