Ok go to this website:
http://www.infinitybit.com/comsec/clippy.html
As you can see it will show what is currently stored on your clipboard this a serious flaw on IE and it has been for more than 3 yeras. Now how is this dengerous... well lets say you have some sensitive data on your clipboard you visit a website it loads and it mails a form with a field from your clipboard and thats all it takes.
Solution:
Users can close this hole by changing the default Internet setting. Preferably, Microsoft
should change the default option to prompt on the Internet zone.
To close this hole in ~7 clicks: Tools, Internet Options, Security, Internet Zone,
Custom Level, Scripting, Allow paste options via scripting -> Disable.
Credits: Steven Vittitoe and Blake Sterzinger