The poster also released a sample of the database, which included names, phone numbers, ID numbers and the health code status of 47 citizens

Shanghai’s health code, or Suishenma, is a programme of QR code developed by the Shanghai Big Data Centre

A database allegedly containing the personal information of 48.5 million citizens based on Shanghai’s health code system has been put on sale online, according to a post on a hacker community website, just one month after a previous alleged data leak involving one billion Chinese residents.