Microsoft has released a Internet Explorer Flash Player update for Windows 8 and Windows Server 2012

Security issues have been identified that could allow an attacker to compromise a computer running Internet Explorer Flash Player for Windows 8 x64 and gain control over it.You can help protect your computer by installing this update from Microsoft.After you install this item, you may have to restart your computer.

Update for Internet Explorer Flash Player for Windows 8 x64 (KB2811522)
Update for Internet Explorer Flash Player for Windows 8 (KB2811522)
Update for Internet Explorer Flash Player for Windows Server 2012 (KB2811522)