Last year and a half taught us that WordPress security should not be dismissed by any means. Between 15% and 20% of the planet's high traffic websites are powered by WordPress. The fact that it is an Open Source platform and everyone has access to its Source Code makes it a tempting prey for hackers.
By default, the latest version of WordPress is pretty secure. Anything that might have been added to some how to fix hacked wordpress site plugins has been considered by the development team of WordPress . Before, WordPress did have holes but most of them are stuffed up.
Backup plug-ins is also significant. You want to backup database and all the files you can easily bring your own site back like nothing.
You also need to set the"Anyone Can Register" in Settings/General to wikipedia reference away, and you ought to have some sort of spam plugin. Akismet is the old standby, the one I use, but there are many of them these days.
You could even get an SSL Encyption Security to your WordPress blogs. The SSL Security makes encrypted and secure communications with your site. So that all transactions are recorded, you can keep the all the cookies and history of communication. Be certain all your blogs get SSL security for protection.
Change your password, or your WordPress password and admin username and collect and use other good WordPress safety tips to keep hackers out!