Adobe has today pushed out a critical Flash Update – please install it today.
Adobe’s advisory for this Flash Update is here. It brings Flash to v. 23.0.0.162 for Windows and Mac users. If you have Flash installed, you should update or remove Flash as soon as possible.
The most recent versions of Flash should be available from this Flash distribution page or the Flash home page. Windows users who browse the Web with anything other than Internet Explorer may need to apply this patch twice, once with IE and again using the alternative browser (Firefox, Opera, e.g.).
Chrome and IE should auto-install the latest Flash version on browser restart (I had to manually check for updates in Chrome an restart the browser to get the latest Flash version).