This is pretty much an unclutter faq. If you run unclutter with -grab, it well, grabs the mouse pointer. This can conflict with other programs, such as screen savers or window managers that also grab the mouse pointer. If that's a problem, then don't use the -grab option.
Calling this a security hole is fairly absurd, IMHO. There are a variety of things that one can do to prevent a screensaver from running, including putting a kitten on your keyboard; this doesn't mean that kittens have security holes. -- see shy jo
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