Onion.io Blog Hacked?
This may be old news, but there are numerous blog posts that have the following appended to the bottom of the post:
HACKED BY SudoX — HACK A NICE DAY.
Googling this syntax brings up numerous results around the web.
It appears the newest posts are not affected, and so this may be an old issue. However it may be something worth the onion team's time investigating to protect our privacy and security.
Maybe this wordpress vulnerability?