For the record you should probably change your password. That way they can’t even try.
Some Microsoft services don't ask for your password anymore, they just send you a code to your register email.
Yeah it turns out that's what nonsense this is.
Worse, I sure as crap never opted into this, but at least you can turn it off.
What a stupid decision some product manager made.
Passwordless is the best.
Not when that password is just an email...
❤️ Passkeys.
The thing that I have seen is while it looks like they are after MFA codes, those emails are a distraction from the actual account they are trying to take over, so be very careful when deleting the emails, there could be a legit email in there asking you to roll back an account change.
Dosen't Microsoft rate limit the attempts? In that case ypu can just select a random number, the trie to brute force it until the code send is the one selected.
It doesn't seem all that limited; I'll get 4-5 in a burst, then nothing for a couple of hours or a day or so, then 4-5 more, and so on.
Been ongoing for a couple of months now, and given it's a random 6 digit number, I don't think they're even remotely doing enough attempts to try to brute force it.
If Microsoft accepts, let's say, 3 attempts per code send, they already tried 1200 numbers (per your 400 emails), it's still short to the 10**6 random attempts on average (supposing that the codes are entirely random). If you email is part of a list of a thousand, they already had tried more that a million and got access to some of them.
I've been getting these for an account even I can't get back into.
Gonna have to get real granular with my inbox filters to send them into the void...
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