I found this post in dslreports.com
Check your ebay account
Ebay had a major snafu. When a registerd user logged on, some were logged into others accounts and had full control, including being able to bid, see paypal accounts, etc. Some folks are now trying to straighten out bids that they did not place.
This has nothing to do with phishing or clicking on misdirected links.
Much discussion going on on the discussion boards, I am only attaching one link though.
http://forums.ebay.com/db2/thread.jspa?threadID=1000161485&tstart=0&mod=1134827286630
Ebay has issued two responses.
Notice they say a "few members", what an understatement.
Hi everyone,
We have received a few reports from members who have let us know they are experiencing issues with Sign In. We are investigating this issue, and we appreciate your patience.
Kind Regards,
~Kristal
eBay Customer Support
Good Morning!
Earlier this evening, we received reports from a few members who were experiencing issues with Sign In. Our engineers have rolled back some newly released code that may have been related to this issue. We are continuing to monitor this situation closely, and we appreciate your patience.
Kind Regards,
~Kristal
eBay Customer Support