Stolen Korean personal data offered for sale online, raising hacking concerns

Information said to belong to patients, university members and customers has appeared on websites where stolen data is shared or sold.

Some of the data includes contact details and sensitive medical information, though the claims about some files have not been verified.

Criminals can use leaked passwords to try to enter accounts on other websites, and AI tools can help automate these attempts.

Experts say stronger security, including more than one way to verify a login, can make attacks harder.