HSE hack may have happened due to something as simple as an employee clicking on a link

A lack of software updates and human error can typically contribute to large organisations' websites being vulnerable to online attacks, according to Smarttech247 CEO Ronan Murphy. File picture: Michael O'Sullivan

Cybersecurity experts last night warned that it could be weeks before HSE systems return to normal after yesterday's ransomware attack.

Ronan Murphy, of Cork-based cybersecurity experts Smarttech247, said it could be into next month before remedial work fixes problems caused by what has been described as "the most significant attack the Irish State has ever had".