Is it dangerous if the number is leaked?

Well, how are you all doing as we approach the summer of the My Number bubble? It just so happens that pension numbers have been leaked in large numbers, and it's been said that this could have an impact on My Numbers, but in the first place, why would anyone make such a fuss about a "number" being leaked more than other personal information such as "address, name, date of birth"...

Further display Is it dangerous if the number is leaked?