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They lost control of it. Meaning, they no longer control access to it.

released or leaked

I like leaked more than the other suggestions, but it still sounds so ... not reckless. There needs to be way more judgement.

How about "discharge"? Yes it's gross but that's the point.

“Leak” sounds small, too, so it gives a minimized impression of what happened.

“Hemorrhage,” perhaps. :)

could call it "negligent public disclosure of personal information"

Why would they leak the data? That seems counter-intuitive to me.

Negligence, incompetence, and apathy.