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Twitter breach exposes anonymous account owners to identity compromise

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A vulnerability in Twitter’s software that exposed an undetermined number of owners of anonymous accounts to potential identity compromise last year was apparently exploited by a malicious actor, the social media company has said.
It did not confirm a report that data on 5.4 million users was offered for sale online as a result but said Friday that users worldwide were affected.
The breach is especially worrisome because many Twitter account owners, including human rights activists, do not disclose their identities in their profiles for security reasons that include fear of persecution by repressive authorities.
This is very bad for many who use pseudonymous Twitter accounts,” US Naval Academy data security expert Jeff Kosseff tweeted.
The vulnerability allowed someone to determine during log-in whether a particular phone number or email address was tied to an existing Twitter account, thereby revealing account owners, the company said.

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