{"id":"CVE-2024-39891","url":"https://www.cyber-defence.io/tools/cve/CVE-2024-39891","generatedAt":"2026-10-31T09:14:17.048Z","title":"Twilio Authy Information Disclosure Vulnerability","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.)","published":"2024-07-02T18:15:03.000Z","lastModified":"2026-06-17T07:42:59.000Z","status":"Analyzed","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"cwe":["CWE-203"],"affected":["twilio/authy","twilio/authy authenticator"],"epss":{"score":0.01669,"percentile":0.76752,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2024-07-23","dueDate":"2024-08-13","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.\nhttps://www.twilio.com/en-us/changelog/Security_Alert_Authy_App_Android_iOS; https://nvd.nist.gov/vuln/detail/CVE-2024-39891"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 13 August 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://cwe.mitre.org/data/definitions/203.html","tags":["Technical Description"],"source":"cve@mitre.org"},{"url":"https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/","tags":["Press/Media Coverage"],"source":"cve@mitre.org"},{"url":"https://www.twilio.com/docs/usage/security/reporting-vulnerabilities","tags":["Product"],"source":"cve@mitre.org"},{"url":"https://www.twilio.com/en-us/changelog","tags":["Release Notes"],"source":"cve@mitre.org"},{"url":"https://cwe.mitre.org/data/definitions/203.html","tags":["Technical Description"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/","tags":["Press/Media Coverage"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.twilio.com/docs/usage/security/reporting-vulnerabilities","tags":["Product"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.twilio.com/en-us/changelog","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-39891","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}