Over at TidBITS, Friday the 13th has long been “Check Your Backups Day”.

I’d like to expand that a bit here at Securosis and declare Thursday the 13th “Update Adobe Flash Day”.

Flash is loaded with vulnerabilities and regularly updated by Adobe, but by most estimates I’ve seen, no more than 20% of people run current versions. Flash is thus one of the most valuable bad-guy vectors for breaking into your computer, regardless of your operating system. While it’s something you should check more than a few random days a year, at least stop reading this, go to Adobe’s site and update your Flash installation.

For the record, I checked and was out of date myself – Flash does not auto update, even on Macs.