We have a LAN which shares a common WAN IP address. My friend logged in into StackOverflow with his login from his PC. He sent a link of a question to me to check it. I opened it in incognito window of Google chrome and I found to be automatically logged in into StackOverflow with my friends account in my PC. Is that caused because of the common WAN IP address for the entire LAN? If so it's a big issue. Any of my friend can get logged in into my account automatically if he is in this LAN and I sent a question link to him.
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closed as too localized by Time Traveling Bobby, hims056, Bo Persson, kiamlaluno, BinaryMisfit Feb 13 '13 at 12:43
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No, that's not possible. Your IP address is never taken into account for authentication, let alone the only thing to authenticate you.
What is possible is that your WAN uses a faulty proxy to cache Stack Overflow responses.