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.)
Metrics
CVSS 3.1 5.3/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
| twilio | authy_2-factor_authentication | < 26.1.0; < 25.1.0 |
| twilio | authy_2-factor_authentication | < 26.1.0; < 25.1.0 |
References
- https://cwe.mitre.org/data/definitions/203.htmlTechnical Description
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/Press/Media Coverage
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilitiesProduct
- https://www.twilio.com/en-us/changelogRelease Notes
- https://cwe.mitre.org/data/definitions/203.htmlTechnical Description
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/Press/Media Coverage
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilitiesProduct
- https://www.twilio.com/en-us/changelogRelease Notes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891US Government Resource
Timeline
- Published
- Jul 2, 2024
- Last modified
- Jun 17, 2026
- Added to CISA KEV
- Jul 23, 2024
- NVD status
- Analyzed