{"id":"CVE-2026-119852","kind":"vulnerability","aliases":["CVE-2026-119852"],"related":[],"title":"Windows Installer: missing authorization lets a local user gain higher privileges","description":"Missing authorization in Windows Installer allows an authorized attacker to elevate privileges locally.","summary":"Windows Installer has a missing authorization check that lets a user who already has an account on the machine raise their privileges. An attacker who is logged in locally could reach administrator-level rights.","severity":"medium","cvss":6.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","local-privilege-escalation","windows","windows-installer"],"not_affected_if":["single-user-machine-with-no-untrusted-accounts"],"how_to_check":"- Check the Windows build with `winver` and compare it to the Microsoft security update that lists this CVE.\n- Confirm Windows Update is installing monthly cumulative updates on managed machines.","fix":null,"status":"open","published_at":"2026-11-10T19:20:02+00:00","first_seen_at":"2026-11-10T19:24:59+00:00","triaged_at":"2026-11-10T19:55:53+00:00","updated_at":"2026-11-10T19:55:53+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:55:53Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Installer: missing authorization lets a local user gain higher privileges","impact":"high","summary":"Windows Installer has a missing authorization check that lets a user who already has an account on the machine raise their privileges. An attacker who is logged in locally could reach administrator-level rights.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-installer","local-privilege-escalation"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains administrator rights on the Windows machine","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-119852 for affected Windows builds and the patch.","how_to_check":"- Check the Windows build with `winver` and compare it to the Microsoft security update that lists this CVE.\n- Confirm Windows Update is installing monthly cumulative updates on managed machines.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["single-user-machine-with-no-untrusted-accounts"],"who_is_affected":"Any Windows machine with an unpatched Windows Installer component is exposed to a local user who already has an account. Shared servers, terminal servers and multi-user workstations matter most. The sources do not name the affected Windows builds.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000699,"input_tokens":4479,"output_tokens":502,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119852':14A,17A '-2026':13A,16A 'account':42B 'administr':59B 'administrator-level':58B 'allow':67C 'alreadi':39B 'attack':50B,70C 'author':4A,32B,63C,69C 'check':33B 'could':56B 'cve':12A,15A 'elev':72C 'escal':22B 'gain':9A 'higher':10A 'infrastructur':18B 'instal':2A,26B,28B,66C 'let':5A,35B 'level':60B 'local':7A,20B,55B,74C 'local-privilege-escal':19B 'log':53B 'machin':45B 'miss':3A,31B,62C 'privileg':11A,21B,48B,73C 'rais':46B 'reach':57B 'right':61B 'user':8A,37B 'window':1A,23B,25B,27B,65C 'windows-instal':24B","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine with an unpatched Windows Installer component is exposed to a local user who already has an account. Shared servers, terminal servers and multi-user workstations matter most. The sources do not name the affected Windows builds.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","localprivilegeescalation","medium","windows","windowsinstaller"],"campaign_type":null,"search_a":"'-119852':14A,17A '-2026':13A,16A 'author':4A 'cve':12A,15A 'gain':9A 'higher':10A 'instal':2A 'let':5A 'local':7A 'miss':3A 'privileg':11A 'user':8A 'window':1A","search_b":"'account':42B 'administr':59B 'administrator-level':58B 'alreadi':39B 'attack':50B 'author':32B 'check':33B 'could':56B 'escal':22B 'infrastructur':18B 'instal':26B,28B 'let':35B 'level':60B 'local':20B,55B 'local-privilege-escal':19B 'log':53B 'machin':45B 'miss':31B 'privileg':21B,48B 'rais':46B 'reach':57B 'right':61B 'user':37B 'window':23B,25B,27B 'windows-instal':24B","search_c":"'allow':67C 'attack':70C 'author':63C,69C 'elev':72C 'instal':66C 'local':74C 'miss':62C 'privileg':73C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:02+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119852","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119852","severity":null,"published_at":"2026-11-10T19:20:02+00:00","modified_at":"2026-11-10T19:20:02+00:00","first_seen_at":"2026-11-10T19:24:59+00:00","fetched_at":"2026-11-10T19:24:59+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"}