Windows 11 KB5074105 Preview Update Fixes Sign-in UI Bug and Adds UAC Gate for Storage Settings
Microsoft released the Windows 11 optional preview cumulative update KB5074105 (for Windows 11 24H2 and 25H2) with multiple fixes and changes, including resolving a known issue where the password sign-in option/icon could disappear from lock screen sign-in options after installing updates dating back to the August 2025 preview update line. Affected users could still authenticate by hovering over the blank area where the password option should appear to reveal the hidden button; Microsoft reports the issue is addressed in KB5074105.
The same KB5074105 preview update also introduces a local hardening change to reduce unauthorized interaction with sensitive system information by adding a mandatory User Account Control (UAC) prompt when accessing Settings > System > Storage. This change is intended to prevent non-admin users (or threat actors with local/remote access to a non-admin session) from viewing or manipulating detailed storage and temporary-file/system-file information without administrative approval, and is being rolled out as an optional “C-release” preview ahead of broader deployment.
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