Contact tracers rely on QR code scan-in technology to locate and isolate potential contacts of confirmed COVID-19 cases. Cybersecurity expert Kate Carruthers, says when it comes to commercial or privately owned QR applications, there is little regulation to prevent data from falling into the wrong hands.

https://www.sbs.com.au/news/thousands-of-australians-targeted-by-coronavirus-scammers-pretending-to-be-government-officials