30.4K accounts from Vastaamo (vastaamo.fi) were exposed in this breach. Besides email addresses, it included social security numbers, which makes it a high-risk breach.
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Email addressesNamesPersonal health dataSocial security numbers
In October 2020, the Finnish psychotherapy service Vastaamo was the subject of a ransomware attack targeting first the company itself, followed by their patients directly. The original security incident dates back to a period between late 2018 and early 2019 and exposed data including 30k unique email addresses, names, social security numbers and notes on individuals' psychotherapy sessions. This breach has been flagged as "sensitive" and is only searchable by owners of the email addresses and domains exposed in the incident.
Source: Have I Been Pwned (CC BY 4.0)