Microsoft has posted a security fix to this. You should run Windows Update if you wish to use IE9 safely. Here is a link with more details about the vulnerability (discovered just last month):
It appeared as a Cumulative Security Update for IE on my machine. Microsoft might have some wacky time scheme for European releases of their updates though.
[Edited by Neo7, 8/15/2012 6:18:03 PM]
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