{"id":"CVE-2020-0837","aliases":["EUVD-2020-2309","GHSA-cxc9-2m79-6f46"],"status":"published","title":"ADFS MFA Elevation of Privilege Vulnerability","description":"\u003cp\u003eAn elevation of privilege vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests. An attacker who successfully exploited this vulnerability could bypass some, but not all, of the authentication factors.\u003c/p\u003e\n\u003cp\u003eTo exploit this vulnerability, an attacker could send a specially crafted authentication request.\u003c/p\u003e\n\u003cp\u003eThis security update corrects how ADFS handles multi-factor authentication requests.\u003c/p\u003e","severity":{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01436,"percentile":0.73313,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2020-09-11T17:08:24Z","modified":"2026-06-17T02:46:43Z","products":[{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1903 for 32-bit systems"},{"vendor":"microsoft","product":"windows 10 version 1903 for arm64-based systems"},{"vendor":"microsoft","product":"windows 10 version 1903 for x64-based systems"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server, version 1903 (server core installation)"},{"vendor":"microsoft","product":"windows server, version 1909 (server core installation)"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0837","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-0837"},{"url":"https://github.com/advisories/GHSA-cxc9-2m79-6f46"}],"sources":{"cve":[{"id":"CVE-2020-0837","title":"ADFS MFA Elevation of Privilege Vulnerability","description":"\u003cp\u003eAn elevation of privilege vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests. An attacker who successfully exploited this vulnerability could bypass some, but not all, of the authentication factors.\u003c/p\u003e\n\u003cp\u003eTo exploit this vulnerability, an attacker could send a specially crafted authentication request.\u003c/p\u003e\n\u003cp\u003eThis security update corrects how ADFS handles multi-factor authentication requests.\u003c/p\u003e","status":"published","published":"2020-09-11T17:08:24Z","modified":"2024-08-04T06:18:03.459Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:35:59.763887Z"}],"euvd":[{"id":"EUVD-2020-2309","description":"\u003cp\u003eAn elevation of privilege vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests. An attacker who successfully exploited this vulnerability could bypass some, but not all, of the authentication factors.\u003c/p\u003e\n\u003cp\u003eTo exploit this vulnerability, an attacker could send a specially crafted authentication request.\u003c/p\u003e\n\u003cp\u003eThis security update corrects how ADFS handles multi-factor authentication requests.\u003c/p\u003e","status":"published","published":"2020-09-11T17:08:24Z","modified":"2024-08-04T06:18:03Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T03:08:17.347367Z"}],"ghsa":[{"id":"GHSA-cxc9-2m79-6f46","title":"A spoofing vulnerability exists when Active Directory Federation Services (ADFS) improperly...","description":"A spoofing vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests.To exploit this vulnerability, an attacker could send a specially crafted authentication request, aka 'ADFS Spoofing Vulnerability'.","status":"published","published":"2022-05-24T17:27:54Z","modified":"2024-01-01T00:30:38Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:55:19.223338Z"}],"nvd":[{"id":"CVE-2020-0837","description":"\u003cp\u003eAn elevation of privilege vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests. An attacker who successfully exploited this vulnerability could bypass some, but not all, of the authentication factors.\u003c/p\u003e\n\u003cp\u003eTo exploit this vulnerability, an attacker could send a specially crafted authentication request.\u003c/p\u003e\n\u003cp\u003eThis security update corrects how ADFS handles multi-factor authentication requests.\u003c/p\u003e","status":"published","published":"2020-09-11T17:15:14.01Z","modified":"2026-06-17T02:46:43.883Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:14.981587Z"}]}}