{"id":"CVE-2026-119929","kind":"vulnerability","aliases":["CVE-2026-119929"],"related":[],"title":"Windows Installer: use-after-free lets a local user gain higher privileges","description":"Use after free in Windows Installer allows an authorized attacker to elevate privileges locally.","summary":"A memory-handling bug in Windows Installer lets an already-authorized local user trigger a use-after-free and elevate their privileges on the machine. The sources give no further technical detail, and an attacker needs a local account first.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows","windows-installer"],"not_affected_if":["no-local-users"],"how_to_check":"- Confirm the Windows build with `winver` and compare it against the Microsoft security update that lists this CVE\n- Check that Windows Update is current with `Get-HotFix` in PowerShell","fix":null,"status":"open","published_at":"2026-11-10T19:20:14+00:00","first_seen_at":"2026-11-10T19:25:03+00:00","triaged_at":"2026-11-10T19:40:14+00:00","updated_at":"2026-11-10T19:40:14+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:40:14Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Installer: use-after-free lets a local user gain higher privileges","impact":"high","summary":"A memory-handling bug in Windows Installer lets an already-authorized local user trigger a use-after-free and elevate their privileges on the machine. The sources give no further technical detail, and an attacker needs a local account first.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-installer"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the machine","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-119929 to get affected Windows builds and the fixed KB or build numbers.","how_to_check":"- Confirm the Windows build with `winver` and compare it against the Microsoft security update that lists this CVE\n- Check that Windows Update is current with `Get-HotFix` in PowerShell\n- unknown for anything beyond this, since the sources do not say which Windows versions are affected","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-users"],"who_is_affected":"Windows machines where a user already has a local account can potentially use this flaw to gain higher privileges. The sources do not list affected Windows versions or the specific fixed builds, so the exact exposure is unknown. Machines where only trusted administrators log in carry less practical risk.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.00072,"input_tokens":4474,"output_tokens":546,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-119929 to get affected Windows builds and the fixed KB or build numbers.","search":"'-119929':16A,19A '-2026':15A,18A 'account':66B 'allow':74C 'alreadi':36B 'already-author':35B 'attack':62B,77C 'author':37B,76C 'bug':29B 'cve':14A,17A 'detail':59B 'elev':47B,79C 'first':67B 'free':6A,45B,70C 'gain':11A 'give':55B 'handl':28B 'higher':12A 'infrastructur':20B 'instal':2A,24B,32B,73C 'let':7A,33B 'local':9A,38B,65B,81C 'machin':52B 'memori':27B 'memory-handl':26B 'need':63B 'privileg':13A,49B,80C 'sourc':54B 'technic':58B 'trigger':40B 'use':4A,43B,68C 'use-after-fre':3A,42B 'user':10A,39B 'window':1A,21B,23B,31B,72C 'windows-instal':22B","nicknames":[],"mitigations":[],"who_affected":"Windows machines where a user already has a local account can potentially use this flaw to gain higher privileges. The sources do not list affected Windows versions or the specific fixed builds, so the exact exposure is unknown. Machines where only trusted administrators log in carry less practical risk.","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":"'-119929':16A,19A '-2026':15A,18A 'cve':14A,17A 'free':6A 'gain':11A 'higher':12A 'instal':2A 'let':7A 'local':9A 'privileg':13A 'use':4A 'use-after-fre':3A 'user':10A 'window':1A","search_b":"'account':66B 'alreadi':36B 'already-author':35B 'attack':62B 'author':37B 'bug':29B 'detail':59B 'elev':47B 'first':67B 'free':45B 'give':55B 'handl':28B 'infrastructur':20B 'instal':24B,32B 'let':33B 'local':38B,65B 'machin':52B 'memori':27B 'memory-handl':26B 'need':63B 'privileg':49B 'sourc':54B 'technic':58B 'trigger':40B 'use':43B 'use-after-fre':42B 'user':39B 'window':21B,23B,31B 'windows-instal':22B","search_c":"'allow':74C 'attack':77C 'author':76C 'elev':79C 'free':70C 'instal':73C 'local':81C 'privileg':80C 'use':68C 'window':72C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:14+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-2026-119929","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119929","severity":null,"published_at":"2026-11-10T19:20:14+00:00","modified_at":"2026-11-10T19:20:14+00:00","first_seen_at":"2026-11-10T19:25:03+00:00","fetched_at":"2026-11-10T19:25:03+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"}