Is this really a threat? (Score 2)

And here I am trying to dampen paranoia about cookies. (I love the Slashdot FAQ on cookies.)

But this bothers me and sounds similar to the bug reported at CookieCentral a long time ago. I'm trying to digest how this is different and what danger (and likelihood of appearance) this represents "in the wild".

Answers here or to me by email would be appreciated.