A mobile application proposed to the government of the Netherlands as a means to track COVID-19 has already fallen short of acceptable security standards by leaking user data . The app , Covid19 Alert , was one of seven applications presented to the Ministry of Health , Welfare , and Sport , as reported by RTL Nieuws . The shortlisted mobile app 's source code was published online over the weekend for scrutiny as the government decides which solution to back . It was not long before developers realized that the source files contained user data -- originating from another application . According to the publication , the app contained close to 200 full names , email addresses , and hashed user passwords stored in a database from another project linked to an Immotef developer . ;