Phew.

There was a little website work done today, and then I realised that I had one of the extensions that were currently found out to have a vulnerability on the site. So after a little bit of hectic checking, verifying, and so (as you do), it should now be completely fixed (at least the part in question has been deactivated and will be completely removed once I have installed and tweaked the replacement). 

Moral of the story: Check your things. And, yes, be lucky sometimes so you catch stuff like that before something really awkward, or annoying, happens...