# CVE-2024-39891: Twilio Authy Information Disclosure Vulnerability

Source: https://junglewise.ai/threats/cve-2024-39891-twilio-authy-information-disclosure-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-07-23. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2024-39891 · Severity: critical · CVSS 5.3 · Exploited in the wild · Published 2024-07-23

The Twilio Authy API contained an unauthenticated endpoint that allowed attackers to verify if specific phone numbers were registered with the service. By submitting a stream of phone numbers, unauthorized actors could perform large-scale information disclosure, though Twilio stated that Authy accounts themselves were not compromised.

## Quick answers

**Is CVE-2024-39891 exploited in the wild?** Yes. CVE-2024-39891 is known to be exploited in the wild, first recorded on 23 July 2024. Treat it as urgent.

**How severe is CVE-2024-39891?** Critical severity, with a CVSS score of 5.3, published 23 July 2024.

**Which products and versions are affected?** Twilio Authy Android before 25.1.0; Twilio Authy iOS before 26.1.0.

**Is there a fix for CVE-2024-39891?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2024-39891 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2024-39891?** Check whether you run Twilio Authy. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Twilio Authy Android before 25.1.0
- Twilio Authy iOS before 26.1.0

## Timeline

- 2024-06: exploited: Exploited in the wild.
- 2024-07-02: disclosed
- 2024-07-23: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
- 2024-07-23: advisory