unauthorized SSH user is run command?

RouterOS General
1

How is it possible that an unauthenticated user did something like that?
RouterOS v6.49.17

/ip ssh set forwarding-enabled=remote strong-crypto=yes

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2

What I see is the router telling that user can’t be authenticated because of strong keys enabled. Log says that if you want that (unknown to the router by now) user to be able to authenticate, you should disable strong keys.

3

Thanks for your answer