As we learned again, most recently with the Equifax data breach, delay in installing security patches and updates for your software as soon as they become available can lead to disastrous consequences.  Hackers have recently discovered a previously unknown flaw in Adobe Flash and are rapidly exploiting it to take over the computers of users of Adobe Flash Player, Desktop Runtime, Adobe Flash Player for Google Chrome, Adobe Flash Player for Microsoft Edge and Internet Explorer 11.  These previously undiscovered flaws are called zero day defects.
Fortunately, Adobe rapidly created security updates to stop the problem.  However, these updates only help you if you install them and I urge you to install them immediately if you use Adobe Flash.
According to security company, Symantec in 2015 80% of the newly discovered software vulnerabilities which can be exploited by malware created by cybercriminals involved Adobe Flash. Adobe has announced that it will be retiring Adobe Flash in 2020.  It will still be issuing security patches until then, but now is a good time to move away from Adobe Flash if you have not already done so.
If you are going to continue to use Adobe Flash, it is imperative that you update your software with the latest security patches when they are issued.  Here is a link to the latest updates for Adobe Flash.
However, it may well be time for you to replace Adobe Flash to avoid future problems.
Here is a link to a website with alternative plugins you may wish to consider to replace Adobe Flash.