Похоже, это поделка финских студентов (С). "Dropbox was accessible with no password, Oops". http://www.tekgoblin.com/2011/06/20/dropbox-was-accessible-with-no-password-oops/
Dropbox confirmed today that for some time yesterday, any users account was accessible without a password. The glitch was a programming error related to a code update and accounts were only vulnerable from around 1:54 pm PST to 5:46pm PST.