Popular end-to-end encrypted messaging service Signal on Monday disclosed the cyberattack aimed at Twilio earlier this month may have exposed the phone numbers of roughly 1,900 users.
"For about 1,900 users, an attacker could have attempted to re-register their number to another device or learned that their number was registered to Signal," the company said. "All users can rest assured that their message history, contact lists, profile information, whom they'd blocked, and other personal data remain private and secure and were not affected."