(Bloomberg) -- Belgium’s app that verifies coronavirus vaccinations reported a data leak, just days before Brussels is set to require people to prove they’ve been jabbed in order to enter restaurants.

A potential leak of the CovidScan app may have exposed the sensitive health data of 39,000 people, the country’s data protection authority said in an emailed press release. The app is used to read the QR codes -- usually on a phone -- that prove people have received a vaccine or have recently tested negative for the virus.

From Friday the nation’s capital will mandate people to show a Covid pass to enter bars, restaurants, sports clubs and hospitals. The measure aims to stoke the local economy and spur vaccinations. 

Brussels’ vaccination rates lag behind the rest of the country forcing it to keep tighter measures in place.

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