Interesting article. Though, their statement in the puzzles is incorrect as I understand it. The solution isn't accidentally sent but was a design decision.
Check Point Research's Blog on Chess.com
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I just saw this article, although it was posted five days ago. I also don't know if the blog has been mentioned here on the site, since I don't read the articles here. Anyway, it was about a couple of vulnerabilities that CPR found on Chess.com. (Note that these vulnerabilities have already been patched.)
https://research.checkpoint.com/2023/checkmate/