Service announcements
2015-05-07 09:45: WordPress 4.2.2, 4.1.5, and 4.0.5 - security updateWordPress 4.2.2, 4.1.5, and 4.0.5 have been released as critical security updates. All previous versions are vulnerable, and must be updated immediately.
It appears that WordPress have now abandoned 3.x. If you have WordPress 3.9 or older, upgrade to 4.2.2 now!
Source: wordpress.org