{
    "id": "CVE-2024-39891",
    "published": "2024-07-02 18:15:03",
    "last_modified": "2026-06-17 07:42:58",
    "cvss_score": "5.3",
    "cvss_severity": "MEDIUM",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
    "cwe": "CWE-203",
    "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.)",
    "epss_score": "0.01669",
    "epss_percentile": "0.75826",
    "kev": 1,
    "kev_due": "2024-08-13",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:35:00",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2024-08-13."
    },
    "products": [
        {
            "vendor": "twilio",
            "product": "authy"
        },
        {
            "vendor": "twilio",
            "product": "authy_authenticator"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2024-39891",
        "date_added": "2024-07-23",
        "due_date": "2024-08-13",
        "vendor": "Twilio",
        "product": "Authy",
        "name": "Twilio Authy Information Disclosure Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "https://cwe.mitre.org/data/definitions/203.html",
        "https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/",
        "https://www.twilio.com/docs/usage/security/reporting-vulnerabilities",
        "https://www.twilio.com/en-us/changelog",
        "https://cwe.mitre.org/data/definitions/203.html",
        "https://www.bleepingcomputer.com/news/security/hackers-abused-api-to-verify-millions-of-authy-mfa-phone-numbers/",
        "https://www.twilio.com/docs/usage/security/reporting-vulnerabilities",
        "https://www.twilio.com/en-us/changelog",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39891"
    ]
}