224K accounts from Wiener Büchereien were exposed in this breach. Besides email addresses, it included dates of birth, names and phone numbers.
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Dates of birthEmail addressesNamesPhone numbersPhysical addresses
In June 2019, the library of Vienna (Wiener Büchereien) suffered a data breach. The compromised data included 224k unique email addresses, names, physical addresses, phone numbers and dates of birth. The breached data was subsequently posted to Twitter by the alleged perpetrator of the breach.
Source: Have I Been Pwned (CC BY 4.0)