An internet security researcher said hackers have stolen the email addresses of more than 200 million Twitter users and posted them on an online hacking forum.
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Alon Gal, the co-founder of Israeli cybersecurity monitoring firm HudsonRock, wrote on LinkedIn last Wednesday that the hack "unfortunately will lead to a lot of hacking, phishing, and theft of sensitive information," according to Reuters.
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He described the theft as "one of the biggest leaks I've seen".
Twitter has not commented on the report, which Gal first posted on social media on Dec. 24, and has not responded to inquiries about the breach since that date.
It may be outdated
It was unclear what action Twitter took to investigate or, if it did, address the issue.
There is no evidence of the identity or location of the hacker or hackers behind the hack, and it may have happened in early 2021 before Elon Musk took ownership of the company last year.