VULNERABILITY DETAILS
When I logged onto my school computer, running chrome book O.S., using my normal, person/home, g-mail account, then went home and logged back into my account,on my personal home tower computer, running windows 10, I cleared all data and passwords from chrome's history, then re-logged into chrome went to you-tube and went to sign in. I then noticed that it was offering multiple other students from my schools e-mail addresses to log into. They have never used my chrome book, and I had the I.T. Department at my school wipe chrome off of the chrome book and reinstall it a few weeks earlier, and this is a personal school laptop. But my point is that it is a dangerous security threat due to the fact that whether or not it gives me the passwords to their e-mail addresses I,or someone meaning to do harm, not me, could use a simple brute force attack to crack the password to a given students e-mail. Gaining tons of personal information that could be very confidential. I would like to point out that I am not sure to the exact extent to which these e-mails addresses' information I have found 'leaked' onto my computer are, seeing as in I have no reason to try them. But I just thought I should point them out.I also feel that I should point out that no student or other person has used another google account on my current computer, my personal home one. I would like to thank you for your time and support in keeping everyone's data safe. 

p.s I have never had anyone from the school bring their chrome book to my home, nor have I ever brought my tower to school.

VERSION
Chrome Book O.S; 47.0.2526.106 + stable

Now the Chrome Version is the newest one, as on my new pc it is fully updated and I had the issue again a day or two ago. I will admit I saw this issue a month back and just kept procrastinating on whether to report it or not, due to the fact that I'v been a bit busy lately. So to get to the point, it is on a few of the newer versions of Google Chrome.

I hope this information helps with improving googles security features/functions
           ~Sincerely Ben Tibbetts IV