Twitter fixes security bug that exposed at least 5.4 million accounts

Twitter says it has fixed a security vulnerability that allowed threat actors to compile information of 5.4 million Twitter accounts, which were listed for sale on a known cybercrime forum.
The vulnerability allowed anyone to enter a phone number or an email address of a known user and learn if it was tied to an existing Twitter account, potentially exposing the identities of pseudonymous accounts.
In a brief statement published Friday, the microblogging giant said, “if someone submitted an email address or phone number to Twitter’s systems, Twitter’s systems would tell the person

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