Between June and July 2018, personal data of 1.5 million patients was exfiltrated as a result of a cyberattack on SingHealth, which is the largest group of healthcare institutions in Singapore and is wholly owned by MOH.

Ler downloaded the information on to a personal thumb drive, which his then-boyfriend Mikhy K Farrera Brochez had leaked online subsequently.

[6] Minister of Health, Gan Kim Yong, explained that data leak had not been announced earlier, so as to safeguard the patients' well-being.

[7][8] On 16 February 2019, MOH released a public statement admitting that there had been an error in computer systems managed by NCS that were used in relation to the Community Health Assist Scheme (CHAS).

MOH announced that it would work with grant scheme administrators and healthcare institutions to follow up with notifications and reimbursement to the affected applicants.