A vulnerability found in Microsoft's Internet Explorer allows hackers to track the movements of your mouse cursor across the screen, which could in turn reveal data entered on virtual keyboards.
Virtual keyboards and keypads can be used to reduce the chance of a keylogger recording every keystroke and therefore being able to "read" your passwords. However Spider.io discovered that Internet Explorer versions 6 to 10 make it possible for your mouse cursor to be tracked anywhere on screen, even if the IE tab is minimized. You can see a video demonstration of the vulnerability embedded in this post, or you can try it yourself at this link (provided you are browsing with IE).
This particular vulnerability is of concern, because if you use Internet Explorer your mouse movements can be recorded even if you never install any software. A hacker simply needs to buy a display advertising placement on any webpage you visit. As long as the tab with the ad remains open, mouse movements can be tracked.