Adobe issued a security bulletin on 4th February 2014, and also issues a emergency security update for the flash player. The Security bulletin says These updates address a critical vulnerability that could potentially allow an attacker to remotely take control of the affected system.
The updates are for the flash player versions 126.96.36.199(or earlier) for Windows and Mac and 188.8.131.525 (or earlier) for Linux.
Read the security bulletin here
So the users of Mac and Windows will have to update the flash players to version 184.108.40.206 and Linux users need to update to 220.127.116.116. If you are using latest versions of Chrome or IE the flash player will get updated automatically. Otherwise update your flash player manually.
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