For those running Win10 V1703 (the Creators Update), it appears Microsoft has held back the Flash Player update 2017-07 Security Update for Adobe Flash Player(KB4025376). So far here, on our v1703 machines, it has failed to provide the update from Windows Updates, (it's simply not showing as an update) and it doesn't show up in the Microsoft Update Catalog either, as indicated in the link below:
https://www.catalog.update.microsoft.com/Search.aspx?q=Kb4025376
The update shows up in the KB4025376 Article as being necessary for v1703 but so far, it's not available. As you see in the Update Catalog link above, it's available for download on the other versions of Windows 10, just not v1703.
Just guessing the update is having issues on Windows 10 v1703 or maybe MS is slow on the uptake here. And also guessing it will be released sometime soon, but who knows?
Hope this helps.
Grif
Published July 11, 2017
Microsoft released new security updates today. Both Critical and Important Updates have been released. Updates include those for Microsoft Edge, Internet Explorer, NET Framework, Flash Player, and others.
Microsoft also released an updated version of the Microsoft Windows Malicious Software Removal Tool on Windows Update, Microsoft Update, Windows Server Update Services, and the Download Center.
July 2017 Security Update Release Notes
Once again, this month's update releases are displayed in the new Security Updates Guide format which replaces the Microsoft Security Bulletins.
Microsoft Security Updates for July 2017
In addition, Microsoft released a number of updates for the various versions of Office.
July 11, 2017 Update Releases for Microsoft Office
Hope this helps.
Grif

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