CVE-2024-39891
Actively exploited. CVE-2024-39891 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-07-23) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
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.
CSIRTS triage
- What
- Twilio Authy contains an information disclosure vulnerability in its API that allows an unauthenticated endpoint to respond with information about registered phone numbers.
- Who is affected
- Unauthenticated users can exploit this vulnerability against any deployment of Authy.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Implement the recommended security measures provided by Twilio.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 71% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2024-39891: Twilio Authy Information Disclosure Vulnerabilitycisa-kev · 2024-07-23
External references
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[](https://www.csirts.com/cve/CVE-2024-39891)