New York( CNN Business) A resulting US real estate and mortgage insurer, First American Financial Corp ., left vulnerable an enormous trove of digital documents, some of which may have contained social security numbers and bank account information.

The information had been hosted online since at least March 2017, according to the post, and nearly 900 million files may have been exposed, though it is not clear if any were improperly accessed.

Some of the documents included bank account numbers and statements, mortgage and tax records, Social security systems numbers, wire transaction receipts, and drivers' license images, according to the Krebs post.