Twitter accidentally exposed the ability to pull an account’s phone number country code and whether the accounts had been locked by Twitter. The concern here is that malicious actors could have used the security flaw to figure out which countries accounts were based in, which could have ramifications for whistleblowers or political dissidents.
The issue came through one of Twitter’s support forms for contacting the company, and the company found that a large number of inquiries through the form came from IP addresses located in China and Saudi Arabia. Twitter writes “While we cannot confirm intent or attribution for certain, it is possible that some of these IP addresses may have ties to state-sponsored actors.” We’ve requested more info on why it’s suggesting that, as well as how many accounts were impacted. Attribution in these situations can be murky, and naming specific countries or suggesting state actors could be involved carry heavy implications.
Twitter began working on the issue on November 15th and fixed it on November 16th. Twitter tells TechCrunch that it has notified the European Union’s Data Protection Commissioner, as EU citizens may have been impacted. However, since country codes aren’t necessarily considered sensitive personal information, the leak may not trigger any GDPR enforcement or fines. Twitter tells us it has also updated the FTC and other regulatory organizations about the issue, though we’ve asked when it informed these different regulators.
Twitter has directly contacted users impacted by the issue, says full phone numbers were not leaked, and users don’t have to do anything in response. Users can contact Twitter here for more info. We’ll have more details shortly.