Mangatoon data breach exposes data from 23 million accounts. Manga comic reading app Mangatoon has suffered a data breach that exposed the account information of 23 million users after a hacker stole it from an Elasticsearch database. Comic reading platform Mangatoon has suffered a data breach that exposed information belonging to 23 million user accounts after a hacker stole it from an unsecured Elasticsearch database. Mangatoon is also a very popular iOS and Android app used by millions of users to read online Manga comics. Third-party company: Elasticsearch.