What it is
Twilio Authy contains an information disclosure vulnerability in its API that allows an unauthenticated endpoint to accept a request containing a phone number and respond with information about whether the phone number was registered with Authy.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- www.twilio.com/en-us/changelog/Security_Alert_Authy_App_Android_iOS
- nvd.nist.gov/vuln/detail/CVE-2024-39891
Description and required action as published by CISA. Full record at NVD.