{"id":"CVE-2026-119398","kind":"vulnerability","aliases":["CVE-2026-119398"],"related":[],"title":"Windows Installer: improper access control lets local user gain higher privileges","description":"Improper access control in Windows Installer allows an authorized attacker to elevate privileges locally.","summary":"Windows Installer has an access control flaw that lets a user who already has an account on the machine raise their privileges. An attacker who can run code locally could gain administrator-level control of the system.","severity":"high","cvss":7.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows","windows-installer"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:54+00:00","first_seen_at":"2026-11-10T19:24:56+00:00","triaged_at":"2026-11-10T19:51:57+00:00","updated_at":"2026-11-10T19:51:57+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:51:57Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Installer: improper access control lets local user gain higher privileges","impact":"high","summary":"Windows Installer has an access control flaw that lets a user who already has an account on the machine raise their privileges. An attacker who can run code locally could gain administrator-level control of the system.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-installer"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local attacker gains elevated system privileges on the machine","analyst_note":"Check the Microsoft Security Update Guide entry for affected Windows builds, fixed KB/build numbers and mitigations; NVD record has no product data.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines where users have local accounts and Windows Installer is in use; the sources do not list affected Windows builds. Systems where only trusted administrators log in are less exposed. unknown for other details.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000654,"input_tokens":4476,"output_tokens":412,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for affected Windows builds, fixed KB/build numbers and mitigations; NVD record has no product data.","search":"'-119398':14A,17A '-2026':13A,16A 'access':4A,27B,62C 'account':38B 'administr':55B 'administrator-level':54B 'allow':67C 'alreadi':35B 'attack':46B,70C 'author':69C 'code':50B 'control':5A,28B,57B,63C 'could':52B 'cve':12A,15A 'elev':72C 'flaw':29B 'gain':9A,53B 'higher':10A 'improp':3A,61C 'infrastructur':18B 'instal':2A,22B,24B,66C 'let':6A,31B 'level':56B 'local':7A,51B,74C 'machin':41B 'privileg':11A,44B,73C 'rais':42B 'run':49B 'system':60B 'user':8A,33B 'window':1A,19B,21B,23B,65C 'windows-instal':20B","nicknames":[],"mitigations":[],"who_affected":"Windows machines where users have local accounts and Windows Installer is in use; the sources do not list affected Windows builds. Systems where only trusted administrators log in are less exposed. unknown for other details.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","windows","windowsinstaller"],"campaign_type":null,"search_a":"'-119398':14A,17A '-2026':13A,16A 'access':4A 'control':5A 'cve':12A,15A 'gain':9A 'higher':10A 'improp':3A 'instal':2A 'let':6A 'local':7A 'privileg':11A 'user':8A 'window':1A","search_b":"'access':27B 'account':38B 'administr':55B 'administrator-level':54B 'alreadi':35B 'attack':46B 'code':50B 'control':28B,57B 'could':52B 'flaw':29B 'gain':53B 'infrastructur':18B 'instal':22B,24B 'let':31B 'level':56B 'local':51B 'machin':41B 'privileg':44B 'rais':42B 'run':49B 'system':60B 'user':33B 'window':19B,21B,23B 'windows-instal':20B","search_c":"'access':62C 'allow':67C 'attack':70C 'author':69C 'control':63C 'elev':72C 'improp':61C 'instal':66C 'local':74C 'privileg':73C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:54+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:H/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-2026-119398","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119398","severity":null,"published_at":"2026-11-10T19:19:54+00:00","modified_at":"2026-11-10T19:19:54+00:00","first_seen_at":"2026-11-10T19:24:56+00:00","fetched_at":"2026-11-10T19:24:56+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"}