There's been a leak about a possible exploit for the Adobe Flash Player, so if you are having that thing installed on your machine (chances are high you have), you should update it as of right now.
You can do that by installing it from the Adobe website (don't forget to uncheck the boxes that say you totally want their crapware), or use this link to download the full installer you need and get it without the crapware stuff.
|I do not want your antivirus thingie, Adobe. Go away.|
Go download and install. Do it now. Seriously. Adobe classifies this as a real risk, and the how-to instructions on using the loophole in their code has been leaked to hacker sites. According to Adobe,
Successful exploitation could cause a crash and potentially allow an attacker to take control of the affected system. Adobe is aware of reports that an exploit targeting this vulnerability has been published publicly. Adobe expects to make updates available on July 8, 2015.
Theoretically, you could deinstall the thing completely and be utterly safe... but so much on the 'net these days uses flash that it could really prove a nuisance. If you are running Firefox, however, you could consider using noscript to block unnecessary stuff including flashy stuff when you don't want to see or use it.
And that's your internet security note for today. : ) Surf safely.