Adobe has shipped a new version of its Flash Player browser plugin to close at least 19 security holes in the program, including one that is already being exploited in active attacks.
The new Flash version, v. 18.104.22.1687 for most Mac and Windows users, includes a fix for a vulnerability (CVE-2015-8651) that Adobe says is being used in “limited, targeted attacks.” If you have Flash installed, please update it.
Better yet, get rid of Flash altogether, or at least disable it until and unless you need it. Doing without Flash just makes good security sense, and it isn’t as difficult as you might think: See my post, A Month Without Adobe Flash Player, for tips on how to minimize the risks of having Flash installed.
The most recent versions of Flash should be available from 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.). This link should tell you whether your system has Flash and if so which version of Flash is installed in your browser.