Cybersecurity expert Chad Loder is claiming 5.4 million European and US Twitter users' accounts have been compromised. The breach resulted in non-public information, including full phone numbers, stolen through an API vulnerability being shared on a hacker forum. The vulnerability was reportedly fixed in January. News of the breach was initially announced on Twitter, but Loder's account was suspended soon after. Loder has since posted the claim on his Mastodon account.
UPDATE: 011222 - Politico reports that the Irish Data Protection Commission has sent a letter to Twitter asking for information about the potential breach.
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