It's claimed medical and personal information about patients is now being shared online.
The Financial Times says it's seen screenshots and files, following the cyber-attack by hackers on the HSE.
The records available online include internal health files, minutes of meetings, equipment purchase details, and correspondence with patients.
Head of the HSE, Paul Reid, is describing the ransomware attack as 'unfair, unjust and incomprehensible'.
People are being warned to expect long delays at emergency departments for the foreseeable future.
However, full maternity services are resuming at the Rotunda Hospital in Dublin this morning.
The ransomware attack had a big impact for several days, as patients' records weren't accessible but appointments can now resume from this morning.