Apple released a security update for their media player, Quicktime, which affects Windows and Mac users. The security flaws found in Quicktime players tend to crash or execute arbitrary code when exploited. More details about the security update here.
Next update is on Adobe Flash Player where an attacker can take control of the affected system upon successful exploitation of the vulnerability found in the player. Adobe tagged this vulnerability as critical and recommends software update on all Windows and Mac OS users of Adobe Flash Player versions 18.104.22.168 and earlier. More details about the update here.
It is advised that users apply security updates not only on the Operating Systems. Security updates should also be applied to third party softwares as these softwares can be an attack vector of malwares compromising your system even if your OS is fully patched.
Users can find the download page of the software updates mentioned by following the hyperlinks: