{"schema":"threatline.record/2","record":{"id":"CVE-2024-39891","aliases":[],"summary":"Twilio Authy Information Disclosure Vulnerability","details":"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.","categories":["Unclassified"],"product":"Authy","vendor":"Twilio","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2024-39891","source_modified_at":"2025-10-21T22:55:50.240Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"n/a","vendor":"n/a","versions":[{"version":"n/a","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":5.3,"severity":"Medium","kev":{"listed":true,"date_added":"2024-07-23","due_date":"2024-08-13","required_action":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.01669,"percentile":0.76617,"score_date":"2026-10-23"},"published_at":"2024-07-02T00:00:00.000Z","modified_at":"2025-10-21T22:55:50.240Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2024-39891","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T22:55:50.240Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2024-39891","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://www.twilio.com/en-us/changelog/Security_Alert_Authy_App_Android_iOS","source":"CISA KEV"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-39891","source":"CISA KEV"},{"source":"CVE List","url":"https://cwe.mitre.org/data/definitions/203.html","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.twilio.com/docs/usage/security/reporting-vulnerabilities","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.twilio.com/en-us/changelog","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"partial","assessed_at":"2024-07-23T03:55:42.678226Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2025-10-21T22:55:50.240Z","content_hash":"0d1772531d8fa3beda941098701dbfca875e075e821a6acd4a920f45d72c5292"}}