It says the lack of access to patient information in hospitals is creating an "extremely high risk" environment.
Some cancer services like chemotherapy are operating at close to full capacity - but there's huge disruption in areas such as mental health.
HSE chief executive Paul Reid says it's going to cost a lot of money to recover from the cyber attack.
Caredoc Wicklow Staff To Join National Strike A Week From Christmas As Pay Agreement Not Respected
Creative Talents Of Greystones Artist Jill Tritschler Recognised With National Award
Tanaiste Harris Hails N11/M11 Upgrade Plans While Wicklow DART Plans Are Firmly On Track
Much Needed Improvements To Separate Sections Of The N81 Road Continue Apace
Ethan Hawke Recounts ‘Wonderful’ Wicklow Experience As ‘Blue Moon’ To Hit Cinemas