CVE-2024-39891
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.)
| Vendor | n/a |
| Product | n/a |
| Published | Jul 2, 2024 |
| Last Updated | Oct 21, 2025 |
⚠️ Actively Exploited — Act Now
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CVSS v3 Breakdown
CVSS:3.1/AC:L/AV:N/A:N/C:L/I:N/PR:N/S:U/UI:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
n/a / n/a
n/a
References
cwe.mitre.org: https://cwe.mitre.org/data/definitions/203.html twilio.com: https://www.twilio.com/docs/usage/security/reporting-vulnerabilities twilio.com: https://www.twilio.com/en-us/changelog bleepingcomputer.com: https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/ cisa.gov: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891