Windows 11 KB5127648 adds taskbar repositioning and 1,400 fixes

Microsoft's mid-October 2026 Windows 11 update KB5127648 lets users move the taskbar to the top, left or right, adds HTML and PDF previews in File Explorer and Copilot key remapping. The release patches over 1,400 vulnerabilities, one of them already exploited, and refreshes Secure Boot certificates.

• Taskbar can now sit at the top, left or right; side positions disable the embedded search bar
• More than 1,400 vulnerabilities fixed, including one exploited via a link or file in email or IM
• File Explorer gains HTML and PDF previews and a fix for crashes in multi-user Azure Virtual Desktop
• NTLMv1 Enforce Mode is now on, breaking some enterprise router connections