They have issued an “out of cycle” patch for this vulnerability.
You need to have Adobe Flash Player 10.3.183.10 (Windows/Mac). There is also a patch for Android and Linux.
http://get.adobe.com/flashplayer/
http://blogs.adobe.com/psirt/2011/09/prenotification-security-update-for-flash-player.html
Google Chrome users do not have to get the patch, it will be installed automatically.