CVE-2024-39891: Twilio Authy Information Disclosure Vulnerability

CISA Known Exploited Vulnerability (KEV)

Description

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.

Required action (CISA)

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

Weakness behind it

CISA records this vulnerability as an instance of CWE-203. From there the chain continues into CAPEC attack patterns and ATT&CK techniques, all inside this corpus.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-39891
• KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog