This seems like a legitimate use-case for permissioned ledgers where various lenders have necessarily siloed lending history data but also have an interest in seeing what data everyone else has for prospective lendees.
In the longer run, you can imagine not just credit history data being exchanged (with the permission of the borrower perhaps) but also the ability to trade the loan products themselves, most of which is done OTC right now. Fixed income contracts can be described as "smart contracts" [1]
That doesn't really fix any security issues, though, it just makes it easier to express who should have permission to access your data. Any system is still vulnerable with, say, a server configured with the credentials admin:admin.
In the longer run, you can imagine not just credit history data being exchanged (with the permission of the borrower perhaps) but also the ability to trade the loan products themselves, most of which is done OTC right now. Fixed income contracts can be described as "smart contracts" [1]
[1] https://lexifi.com/files/resources/MLFiPaper.pdf