CVE-2024-39891
Published 2024-07-02 · Updated 2026-06-17 · Source cve@mitre.org
Summary
CVE-2024-39891 is a medium-severity (CVSS 5.3) vulnerability in Twilio Authy. CISA added it to the Known Exploited Vulnerabilities catalog on July 23, 2024, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by August 13, 2024. CISA does not currently list it as used in ransomware campaigns.
All 1 known-exploited Twilio vulnerabilities →Description
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.)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA Known-Exploited Vulnerability
Product: Twilio — Authy
Name: Twilio Authy Information Disclosure Vulnerability
Date added: 2024-07-23 · Due: 2024-08-13
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
References
- https://cwe.mitre.org/data/definitions/203.html
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilities
- https://www.twilio.com/en-us/changelog
- https://cwe.mitre.org/data/definitions/203.html
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilities
- https://www.twilio.com/en-us/changelog