A misconfigured server exposed the taxpayer identification numbers, or Cadastro de Pessoas F..sicas (CPF) numbers, for 120 million Brazilian nationals for an unknown period of time. A database file that contained data related to CPFs, personal information, military info, telephone, loans, and addresses. The server was not properly configured and thus exposed data archives that were stored on it. It is not known if any other researchers, or criminals, had discovered the data before it was taken offline.
Source: https://www.bleepingcomputer.com/news/security/taxpayer-id-numbers-for-120-million-brazilians-exposed-online/