Log in via an open Wi-Fi connection

There is an open wifi connection in my office. I log in to my MBA account on my office via this wifi connection to get my sales update. But some of my colleagues also use this wifi connection to log in on MBA account. Will there any problem regarding the same wifi connection to log in different MBA account? Moreover, a few days ago my friend were visited to my house. He also used my wifi connection for log in his MBA account. Is there any problem??

Log in via an open Wi-Fi connection

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