Encrypted messaging service Signal said the phone numbers of 1,900 users may have been exposed in a phishing attack on Twilio Inc, its verification service provider, earlier this month.
The attacker may also have accessed the SMS verification code used to sign up for Signal, but message history, profile information and contact lists were not revealed, the company said Monday in a blog post
“An attacker could have tried to re-register the number on another device or know that their number was registered with Signal,” he said.
Twilio, which disclosed the attack earlier this month, said it has been working alongside Signal to help with its investigation.
The San Francisco, California-based company counts more than 256,000 businesses, including Ford Motor Co, Mercado Libre Inc and HSBC, among its customers.
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