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I am going to be very curious to see if there are any downsides or negatives at all to this hacking happening. In theory this information could be used to scam a lot of Danes. In practice these major hacks end up fizzling out, in my experience - the data being less useful or more duplicated than people thought.
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Just because we cannot identify any disadvantages does not mean that there are none.

Imagine a foreign state-sponsored agent waiting at the door of a public or private decision-maker, convincing them to cooperate. Home addresses are no joke. Especially if you can grep through the whole family tree.

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It is more or less trivial to find someone's home address now if you try at all. Thats my point on duplicated data in hacks.
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It really depends and I often struggle with it. How do you do it?

The German Melderegisters, for example, are now far more interested in the stated reason for your data request than they were ten years ago. (Which is a good thing!)

Many things that are trivial in theory, given the right conditions, etc. are anything but trivial once you actually try to do it.

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I think you mean MitID, but yes. I have tried going through the process of getting a new MitID at the citizen service desk, and the questions I am asked to verify that it is me are almost all family related. If the leaked data reveals things like parent/child and spouse relationships then that process is cooked.
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according to this article which I linked earlier because I thought the non-Danish readers might appreciate it, it "can include" family relationships

https://cphpost.dk/2026-10-05/life-in-denmark/cpr-data-breac...

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ah yes, sorry, I worked on the NemID project and I often put NemID in place of MitID when I'm tired.
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