Just try this:
1) Copy any text by ‘ctrl+c’
2) Click the Link: http://www.sourcecodesworld.com/special/clipboard.asp
You will see the text you copied on the Screen which was accessed by this web page. (Check it out !!)
I have tested it under IE and Firefox.
Firefox is secure and does not pass your clipboard data. I have a fairly default Firefox configuration and it appears to be secure “out of the box.”
IE, on the other hand, gave up my clipboard contents to a complete stranger. That is not acceptable!
What to do in IE:
1) In Internet Explorer, Go to Tools -> Internet options -> Security
2) Press Custom level.
3) In the security settings, select disable under Allow paste operations via script and click on ‘OK. (Now the contents of your clipboard are safe.)
So , Its clear that , IE has still a long path to go !