Reading between the lines, there was only one, minor security fix -- the KB 3214288/MS17-001 patch for Edge that cures an elevation of privilege problem when viewing a web page. Peanuts. The Security Bulletin system goes away next month, so starting in February it will likely be much more difficult to nail down security components of Win10 cumulative updates.
All three of the cumulative updates have this acknowledged "known issue":
Users may experience delayed or clipped screens while running 3D rendering apps (such as games) on systems with more than one monitor.
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