I'm not sure what to say about this one. It's a good thing that they fixed a flaw, but a bad thing they didn't tell anyone. It certainly is a busy news day for you isn't it?
That must be a first. A developer apologising about a bug in their software. I'm not entirelly sure why they need to apologise? Its not like they did it on purpose.
Apologies are customary for any unintentional mistake or inconvenience caused. It's like when you accidentally bump into someone and say: "sorry". If it was deliberate, obviously no apologies would apply.