After my pc went through an update last night, which updates were performed I am not cure, I tried to login to Facebook. When I pulled up Facebook using Chrome, another user's email and password were loaded in the login fields. Out of curiosity into how this could have occurred I attempted to login. Facebook recognized the username/password combination, but because the password was outdated, login was denied. But, the credentials corresponded to an actual user. After some investigating, I discovered that the user was an old contact I have stored in my phone from a company I worked with in the past. I do not know how or why my desktop pc would be able to pull that contact's personal email address and password and apply it into Facebook.

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VULNERABILITY DETAILS
Please provide a brief explanation of the security issue.

VERSION
Chrome Version: Version 49.0.2623.87 m
Operating System: Windows 10

REPRODUCTION CASE
I have included screenshots of what I found.