{"id":"CVE-2026-88245","kind":"vulnerability","aliases":["CVE-2026-88245"],"related":[],"title":"Windows Brokering File System: missing authentication lets local users gain privileges","description":"Missing authentication for critical function in Windows Brokering File System allows an authorized attacker to elevate privileges locally.","summary":"The Windows Brokering File System has a critical function that lacks an authentication check. An attacker with a local account can use it to elevate their privileges on the machine.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows Brokering File System","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["infrastructure","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","triaged_at":"2026-11-10T19:38:33+00:00","updated_at":"2026-11-10T19:38:33+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:38:33Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Brokering File System: missing authentication lets local users gain privileges","impact":"high","summary":"The Windows Brokering File System has a critical function that lacks an authentication check. An attacker with a local account can use it to elevate their privileges on the machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains higher privileges, possibly full control of the machine","analyst_note":"Confirm affected Windows builds and the Microsoft patch and KB from the MSRC advisory for CVE-2026-88245.","how_to_check":"- unknown","plain_action":"","product_name":"Windows Brokering File System","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Affects Windows systems with the Brokering File System component; the sources do not list affected Windows builds. Exposure requires an attacker who already has a local, authorized account on the machine. unknown","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000658,"input_tokens":4485,"output_tokens":418,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Confirm affected Windows builds and the Microsoft patch and KB from the MSRC advisory for CVE-2026-88245.","search":"'-2026':13A,16A '-88245':14A,17A 'account':43B 'allow':64C 'attack':39B,67C 'authent':6A,36B,55C 'author':66C 'broker':2A,26B,61C 'brokering':19A 'check':37B 'critic':31B,57C 'cve':12A,15A 'elev':48B,69C 'file':3A,20A,27B,62C 'function':32B,58C 'gain':10A 'infrastructur':22B 'lack':34B 'let':7A 'local':8A,42B,71C 'machin':53B 'miss':5A,54C 'privileg':11A,50B,70C 'system':4A,21A,28B,63C 'use':45B 'user':9A 'window':1A,23B,25B,60C 'windows':18A","nicknames":[],"mitigations":[],"who_affected":"Affects Windows systems with the Brokering File System component; the sources do not list affected Windows builds. Exposure requires an attacker who already has a local, authorized account on the machine. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["brokeringfilesystem","windowsbrokeringfilesystem"],"ptokens":["brokering","file","system","windows"],"labels":["high","infrastructure","vendor","windows"],"campaign_type":null,"search_a":"'-2026':13A,16A '-88245':14A,17A 'authent':6A 'broker':2A 'brokering':19A 'cve':12A,15A 'file':3A,20A 'gain':10A 'let':7A 'local':8A 'miss':5A 'privileg':11A 'system':4A,21A 'user':9A 'window':1A 'windows':18A","search_b":"'account':43B 'attack':39B 'authent':36B 'broker':26B 'check':37B 'critic':31B 'elev':48B 'file':27B 'function':32B 'infrastructur':22B 'lack':34B 'local':42B 'machin':53B 'privileg':50B 'system':28B 'use':45B 'window':23B,25B","search_c":"'allow':64C 'attack':67C 'authent':55C 'author':66C 'broker':61C 'critic':57C 'elev':69C 'file':62C 'function':58C 'local':71C 'miss':54C 'privileg':70C 'system':63C 'window':60C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:34+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-2026-88245","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88245","severity":null,"published_at":"2026-11-10T19:21:34+00:00","modified_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","fetched_at":"2026-11-10T19:25:20+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"}