{"id":"CVE-2026-121680","kind":"vulnerability","aliases":["CVE-2026-121680"],"related":[],"title":"Windows NTLM: information exposure lets an attacker spoof over the network","description":"Exposure of sensitive information to an unauthorized actor in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.","summary":"Windows NTLM authentication exposes sensitive information to unauthorized actors, enabling spoofing over a network. The sources do not say what data leaks or what the attacker needs beyond network reach.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows NTLM","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["active-directory","ntlm","other","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:20:31+00:00","first_seen_at":"2026-11-10T19:25:09+00:00","triaged_at":"2026-11-10T19:44:22+00:00","updated_at":"2026-11-10T19:44:22+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T19:44:22Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows NTLM: information exposure lets an attacker spoof over the network","impact":"medium","summary":"Windows NTLM authentication exposes sensitive information to unauthorized actors, enabling spoofing over a network. The sources do not say what data leaks or what the attacker needs beyond network reach.","audience":"businesses","category":"other","nicknames":[],"who_cares":["windows","ntlm","active-directory"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"attacker spoofs network authentication and reads sensitive information","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-121680 for affected Windows builds, the fixed update and whether a user must act; NVD text is minimal.","how_to_check":"- unknown","plain_action":"","product_name":"Windows NTLM","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows systems that use NTLM authentication on a network are the likely exposure; the sources do not name affected versions or preconditions. unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000671,"input_tokens":4504,"output_tokens":441,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-121680 for affected Windows builds, the fixed update and whether a user must act; NVD text is minimal.","search":"'-121680':14A,17A '-2026':13A,16A 'activ':21B 'active-directori':20B 'actor':34B,63C 'allow':67C 'attack':7A,51B,70C 'authent':28B 'beyond':53B 'cve':12A,15A 'data':46B 'directori':22B 'enabl':35B 'expos':29B 'exposur':4A,56C 'inform':3A,31B,59C 'leak':47B 'let':5A 'need':52B 'network':11A,39B,54B,76C 'ntlm':2A,19A,23B,27B,66C 'perform':72C 'reach':55B 'say':44B 'sensit':30B,58C 'sourc':41B 'spoof':8A,36B,73C 'unauthor':33B,62C,69C 'window':1A,25B,26B,65C 'windows':18A","nicknames":[],"mitigations":[],"who_affected":"Windows systems that use NTLM authentication on a network are the likely exposure; the sources do not name affected versions or preconditions. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["ntlm","windowsntlm"],"ptokens":["ntlm","windows"],"labels":["activedirectory","high","ntlm","other","vendor","windows"],"campaign_type":null,"search_a":"'-121680':14A,17A '-2026':13A,16A 'attack':7A 'cve':12A,15A 'exposur':4A 'inform':3A 'let':5A 'network':11A 'ntlm':2A,19A 'spoof':8A 'window':1A 'windows':18A","search_b":"'activ':21B 'active-directori':20B 'actor':34B 'attack':51B 'authent':28B 'beyond':53B 'data':46B 'directori':22B 'enabl':35B 'expos':29B 'inform':31B 'leak':47B 'need':52B 'network':39B,54B 'ntlm':23B,27B 'reach':55B 'say':44B 'sensit':30B 'sourc':41B 'spoof':36B 'unauthor':33B 'window':25B,26B","search_c":"'actor':63C 'allow':67C 'attack':70C 'exposur':56C 'inform':59C 'network':76C 'ntlm':66C 'perform':72C 'sensit':58C 'spoof':73C 'unauthor':62C,69C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:31+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121680","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121680","severity":null,"published_at":"2026-11-10T19:20:31+00:00","modified_at":"2026-11-10T19:20:31+00:00","first_seen_at":"2026-11-10T19:25:09+00:00","fetched_at":"2026-11-10T19:25:09+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}