Users are being notified by Twitter that tweets they posted to their Circle that were intended to be viewable by only certain people may have also been exposed to others.
Twitter Circle, which was introduced in August 2022, enables users to communicate with up to 150 carefully chosen users.
Users first noticed that tweets intended to be shared just with those in their Circle were instead available to people who weren't even following them in April.
Affected Circle members have lately been receiving emails from Twitter confirming the data breach, which the company has referred to as a "security incident."
Twitter says in these emails, "In April 2023, a security event may have permitted persons outside of your Twitter Circle to read tweets that should have been restricted to the Circle to which you were posting. "Our security team discovered the problem and resolved it right away so that these tweets were no longer visible outside of your Circle."
Despite claiming to have thoroughly investigated the root of the problem, Twitter withheld any technical information.
Data security vulnerabilities on Twitter are not unusual. For instance, a flaw that was addressed at the beginning of 2022 was used to gather information on millions of Twitter users.
But not all instances of Twitter user information appearing on the dark web are caused by the exploitation of a vulnerability. The social media behemoth informed users earlier this year that two databases with 200 million and 400 million entries, respectively, were not produced as a result of a vulnerability being exploited, validating third-party reports that they were most likely obtained through web scraping.
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