CVEvulnerability

CVE-2024-39891

5.3 MEDIUM Known exploited Published 2024-07-02 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Twilio Authy Information Disclosure Vulnerability — Twilio Authy

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.

Added to KEV: 2024-07-23
Remediation due: 2024-08-13
Ransomware use: Unknown
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Notes: https://www.twilio.com/en-us/changelog/Security_Alert_Authy_App_Android_iOS; https://nvd.nist.gov/vuln/detail/CVE-2024-39891

Status: Analyzed
Published: 2024-07-02
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS 3.1 ([email protected]): 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses: CWE-203

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.)

Affected configurations

• twilio authy (< 26.1.0) • twilio authy authenticator (< 25.1.0)

Weakness · CWE (1)

CWE-203 Observable Discrepancy weakness

References