2018 api vuln ( no clue if it got exploited )
https://www.reddit.com/r/anime/comments/8lsm5i/myanimelist_compromisedvulnerable_probably_best/
apparently other years were also hacked but nothing was addressed
does anyone else have more info on this?

update owner message about this vuln/leak

pretty sure this is fixed, as MyAnimeList removed (or upgrade to a new one) its api time ago, maybe this was made using a 3rd-party app as the MyAniList said (https://libreddit.kavin.rocks/r/anime/comments/8lsm5i/comment/dziwjck)

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mmhm, yeah seems like something with a 3rd-party apps https://myanimelist.net/forum/?topicid=1731450