Twilio Authy Security Notification

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Twilio Authy Security Notification

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The Twilio Security Team recently detected that a threat actor was able to identify data associated with Authy accounts, including phone numbers, due to an unauthenticated API endpoint. We have taken action to secure this endpoint and no longer allow unauthenticated requests.

There is no evidence of a breach of Twilio’s systems or other sensitive data.

Key Points:

  • Twilio did not leak the bulk list of phone numbers. The threat actor tested millions of phone numbers to identify numbers associated with Authy accounts.
  • They bypassed our protections using multiple IP addresses.
  • The affected API endpoint is used exclusively by the Authy app during device registration and not by business customers. The API is now secure and does not allow requests from unvalidated mobile devices.

Action Required:

  • Update your Authy app: Please update your Authy app to the latest Android and iOS app versions to receive the latest security updates.
  • Stay vigilant: Although your Authy account is secure, threat actors might use associated phone numbers for phishing and smishing attacks. Be extra cautious and verify the legitimacy of any texts you receive.

Additional Resources:

CVE Publication

Twilio Changelog

Published at N/A

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