CVE-2024-39891 — Twilio Authy Information Disclosure Vulnerability

Overview

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.

Vulnerability details

CVE ID

CVE-2024-39891

Vulnerability

Twilio Authy Information Disclosure Vulnerability

Vendor

Twilio

Affected products

Twilio: Authy

Severity

HIGH

Exploitation status

Actively exploited in the wild (CISA KEV)

Published

2024-07-23

Remediation guidance

CVE-2024-39891 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.

Apply the vendor's official security update for Twilio the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.

Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.

Authoritative references

• NVD — National Vulnerability Database
• MITRE CVE Record
• CISA Known Exploited Vulnerabilities Catalog
• FIRST EPSS — Exploit Prediction Scoring