if you mean the powershell defender errors, they occured on every windows 10 version since 1607 (not sure about 1507). -andy-
Don't be so sure. If this is to address a live exploit you may not even need to be using IE to become compromised. If MS is breaking its own rules to release a security fix it is likely an important update.
I still don't get it as to why it's not offered through Windows updates to the public and must be downloaded and installed manually?
MSFT does this regularly. Lately the catalog only update also gets moved to the optional update (seeker) function of WU.
Microsoft is likely going to be pushing out more updates this week, which will include this fix which could be the reason why it's not being pushed out through Windows Update. But they needed to make this patch available to anyone that needs it ASAP.
Should be part of the cumulative for October in two weeks or so though if Microsoft is pushing this as a separate download quickly it's likely a important security fix for whatever since the update notes rarely go into detail on the nature of the exploit itself or fix for it though I think there used to be a security bulletin for some of these types of patches too although that might have been before Windwos 10 and the shift into monthly cumulative roll-up patches. 1909 or 18363.x whatever the build will turn into should also not be too far out though there's still the rest of the week if it's going to be a September launch or perhaps a early October update whatever the state of that is in, current .1019 update is lacking the latest cumulative for 19H1 and fixes to for example the Cortana CPU issue so that would get merged in among whatever else will get changed once this goes live and the final version of this update is out probably with new install media too at that point. EDIT: Hmm that's right there's occasionally a later update or series of update after the usual monthly cumulative or patch Tuesday batch. EDIT: Although installing it early couldn't really harm anything either depending on what exactly it does fix for this security patch. (Seems like it would be quite urgent though pushing it out like this even if starts as a catalogue only separate download.)