CVE-2024-39891
mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.017 · 77 %ileEURUUSadded 2024-07-23remediate by 2024-08-13
required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS · scored 2026-10-22
Twilio Authy Information Disclosure Vulnerability
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.)
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (5)
Products and version ranges known to be affected.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (15)
External citations — patches, advisories, analysis.
- https://authy.com/Patchcnnvd
- https://cwe.mitre.org/data/definitions/203.htmlcnnvd
- https://cxsecurity.com/cveshow/CVE-2024-39891/cnnvd
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/cnnvd
- https://www.twilio.com/docs/usage/security/reporting-vulnerabilitiescnnvd
- https://www.twilio.com/en-us/changelogcnnvd
- https://cwe.mitre.org/data/definitions/203.htmlenisa_euvd
- https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/enisa_euvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan