CVE-2024-39891: Twilio Authy Information Disclosure Vulnerability

Medium severity, CVSS 5.3. Actively exploited: in CISA KEV since 2024-07-23. EPSS: 1.7% chance of exploitation in the next 30 days.

In the Twilio Authy API, accessed by Authy Android before 25.1.0 and Authy iOS before 26.1.0, an unauthenticated endpoint provided access to certain phone-number data, as exploited in the wild in June 2024. Specifically, the endpoint accepted a stream of requests containing phone numbers, and responded with information about whether each phone number was registered with Authy. (Authy accounts were not compromised, however.)

Affected products

• Twilio Authy: before 26.1.0 (fixed in 26.1.0)
• Twilio Authy Authenticator: before 25.1.0 (fixed in 25.1.0)

Published 2024-07-02. Last modified 2026-06-17.