{"id":"CVE-2026-85929","kind":"vulnerability","aliases":["CVE-2026-85929"],"related":[],"title":"Windows Brokering File System: local attacker can elevate privileges","description":"Incorrect permission assignment for critical resource in Windows Brokering File System allows an authorized attacker to elevate privileges locally.","summary":"A permission assignment flaw in the Windows Brokering File System lets an authorized local user raise their privileges. The attacker needs an existing local account first.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:26+00:00","first_seen_at":"2026-11-10T19:25:18+00:00","triaged_at":"2026-11-10T19:38:45+00:00","updated_at":"2026-11-10T19:38:45+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:38:45Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Brokering File System: local attacker can elevate privileges","impact":"high","summary":"A permission assignment flaw in the Windows Brokering File System lets an authorized local user raise their privileges. The attacker needs an existing local account first.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains higher privileges on the Windows machine","analyst_note":"Check the NVD entry and Microsoft's security update guide for affected Windows builds and the patch.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Affects Windows machines with the Brokering File System component, where a local user with an existing account can escalate privileges. The sources do not list affected Windows builds or whether the component is enabled by default. Shared multi-user hosts and systems with untrusted local users are the most exposed.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000649,"input_tokens":4494,"output_tokens":399,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the NVD entry and Microsoft's security update guide for affected Windows builds and the patch.","search":"'-2026':11A,14A '-85929':12A,15A 'account':42B 'allow':55C 'assign':20B,46C 'attack':6A,37B,58C 'author':30B,57C 'broker':2A,25B,52C 'critic':48C 'cve':10A,13A 'elev':8A,60C 'exist':40B 'file':3A,26B,53C 'first':43B 'flaw':21B 'incorrect':44C 'infrastructur':16B 'let':28B 'local':5A,31B,41B,62C 'need':38B 'permiss':19B,45C 'privileg':9A,35B,61C 'rais':33B 'resourc':49C 'system':4A,27B,54C 'user':32B 'window':1A,17B,24B,51C","nicknames":[],"mitigations":[],"who_affected":"Affects Windows machines with the Brokering File System component, where a local user with an existing account can escalate privileges. The sources do not list affected Windows builds or whether the component is enabled by default. Shared multi-user hosts and systems with untrusted local users are the most exposed.","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":"'-2026':11A,14A '-85929':12A,15A 'attack':6A 'broker':2A 'cve':10A,13A 'elev':8A 'file':3A 'local':5A 'privileg':9A 'system':4A 'window':1A","search_b":"'account':42B 'assign':20B 'attack':37B 'author':30B 'broker':25B 'exist':40B 'file':26B 'first':43B 'flaw':21B 'infrastructur':16B 'let':28B 'local':31B,41B 'need':38B 'permiss':19B 'privileg':35B 'rais':33B 'system':27B 'user':32B 'window':17B,24B","search_c":"'allow':55C 'assign':46C 'attack':58C 'author':57C 'broker':52C 'critic':48C 'elev':60C 'file':53C 'incorrect':44C 'local':62C 'permiss':45C 'privileg':61C 'resourc':49C 'system':54C 'window':51C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:26+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-2026-85929","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85929","severity":null,"published_at":"2026-11-10T19:21:26+00:00","modified_at":"2026-11-10T19:21:26+00:00","first_seen_at":"2026-11-10T19:25:18+00:00","fetched_at":"2026-11-10T19:25:18+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"}