A critical vulnerability has been discovered in Adobe Flash Player 10.0.45.2 and Adobe Reader/Acrobat 9.x, and could potentially be used to target World of Warcraft players and accounts. The newest available version of Adobe Flash 10.1, Release Candidate 7 (available at http://labs.adobe.com/technologies/flashplayer10/), does not appear to contain this vulnerability, and we recommend that everyone upgrade their Flash player as soon as possible. Earlier versions of Adobe Reader and Acrobat, specifically version 8.x, do not appear to contain this vulnerability, either.

For more information, please visit Adobe.com: http://www.adobe.com/support/security/advisories/apsa10-01.html

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I would also like to add that this is NOT a virus. The only way to protect yourself from this kind of vulnerability is to keep your system up-to-date in all ways, including Flash.