{"id":"CVE-2026-119821","kind":"vulnerability","aliases":["CVE-2026-119821"],"related":[],"title":"Windows Network Connection Broker flaw lets a local user gain higher privileges","description":"Improper authorization in Windows Network Connection Broker allows an authorized attacker to elevate privileges locally.","summary":"Windows Network Connection Broker does not check authorization properly, so a user who already has an account on the machine can raise their privileges. The sources describe no remote trigger, so the impact is local privilege escalation to a higher-privileged account.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":"- Check the installed Windows build with `winver` and compare it to the fixed build in Microsoft's advisory for CVE-2026-119821","fix":null,"status":"open","published_at":"2026-11-10T19:19:56+00:00","first_seen_at":"2026-11-10T19:24:57+00:00","triaged_at":"2026-11-10T19:40:27+00:00","updated_at":"2026-11-10T19:40:27+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:40:27Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Network Connection Broker flaw lets a local user gain higher privileges","impact":"high","summary":"Windows Network Connection Broker does not check authorization properly, so a user who already has an account on the machine can raise their privileges. The sources describe no remote trigger, so the impact is local privilege escalation to a higher-privileged account.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains administrator or SYSTEM privileges on the machine","analyst_note":"Find the affected Windows builds and the Microsoft update for CVE-2026-119821 at https://nvd.nist.gov/vuln/detail/CVE-2026-119821 or the Microsoft Security Update Guide.","how_to_check":"- Check the installed Windows build with `winver` and compare it to the fixed build in Microsoft's advisory for CVE-2026-119821\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Windows machines where a person or process already has a local account can use this flaw to elevate privileges. The sources do not list affected Windows builds or the fixed update. Machines with no untrusted local users carry lower risk.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000707,"input_tokens":4488,"output_tokens":517,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the affected Windows builds and the Microsoft update for CVE-2026-119821 at https://nvd.nist.gov/vuln/detail/CVE-2026-119821 or the Microsoft Security Update Guide.","search":"'-119821':15A,18A '-2026':14A,17A 'account':37B,63B 'allow':71C 'alreadi':34B 'attack':74C 'author':28B,65C,73C 'broker':4A,24B,70C 'check':27B 'connect':3A,23B,69C 'cve':13A,16A 'describ':47B 'elev':76C 'escal':57B 'flaw':5A 'gain':10A 'higher':11A,61B 'higher-privileg':60B 'impact':53B 'improp':64C 'infrastructur':19B 'let':6A 'local':8A,55B,78C 'machin':40B 'network':2A,22B,68C 'privileg':12A,44B,56B,62B,77C 'proper':29B 'rais':42B 'remot':49B 'sourc':46B 'trigger':50B 'user':9A,32B 'window':1A,20B,21B,67C","nicknames":[],"mitigations":[],"who_affected":"Windows machines where a person or process already has a local account can use this flaw to elevate privileges. The sources do not list affected Windows builds or the fixed update. Machines with no untrusted local users carry lower risk.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","windows"],"campaign_type":null,"search_a":"'-119821':15A,18A '-2026':14A,17A 'broker':4A 'connect':3A 'cve':13A,16A 'flaw':5A 'gain':10A 'higher':11A 'let':6A 'local':8A 'network':2A 'privileg':12A 'user':9A 'window':1A","search_b":"'account':37B,63B 'alreadi':34B 'author':28B 'broker':24B 'check':27B 'connect':23B 'describ':47B 'escal':57B 'higher':61B 'higher-privileg':60B 'impact':53B 'infrastructur':19B 'local':55B 'machin':40B 'network':22B 'privileg':44B,56B,62B 'proper':29B 'rais':42B 'remot':49B 'sourc':46B 'trigger':50B 'user':32B 'window':20B,21B","search_c":"'allow':71C 'attack':74C 'author':65C,73C 'broker':70C 'connect':69C 'elev':76C 'improp':64C 'local':78C 'network':68C 'privileg':77C 'window':67C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:56+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119821","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119821","severity":null,"published_at":"2026-11-10T19:19:56+00:00","modified_at":"2026-11-10T19:19:56+00:00","first_seen_at":"2026-11-10T19:24:57+00:00","fetched_at":"2026-11-10T19:24:57+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"}