MIT IS&T recommends that all users update Flash Player ASAP.

This update addresses a serious vulnerability in Adobe Flash that allows a remote attacker to execute arbitrary code on the vulnerable host. This vulnerability affects the Windows, Macintosh and Linux versions of Adobe Flash as follows:

Adobe Flash Player 18.0.0.161 and earlier versions for Windows and Macintosh Adobe Flash Player Extended Support Release version 13.0.0.292 and
earlier 13.x versions for Windows and Macintosh Adobe Flash Player 11.2.202.466 and earlier 11.x versions for Linux

This vulnerability has already been actively exploited in the wild and is classified as CVE-2015-3113.