Obtained by enumerating a vulnerable API, the data had earlier appeared for sale in January 2023 and contained email addresses, names, the languages being learned, XP (experience points), and other data related to learning progress on Duolingo.

Breach date: 24 January 2023
Date added to HIBP: 23 August 2023
Compromised accounts: 2,676,696
Compromised data: Email addresses, Names, Spoken languages, Usernames
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src: haveibeenpwned