{"id":"CVE-2026-119399","kind":"vulnerability","aliases":["CVE-2026-119399"],"related":[],"title":"Windows Installer: double free lets a local user gain higher privileges","description":"Double free in Windows Installer allows an authorized attacker to elevate privileges locally.","summary":"A memory bug (double free) in Windows Installer lets an attacker who already has a local account raise their privileges. Nothing in the sources says how the bug is triggered beyond that.","severity":"high","cvss":7.0,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows Installer","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"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":"2026-11-10T19:24:57+00:00","triaged_at":"2026-11-10T19:52:01+00:00","updated_at":"2026-11-10T19:52:01+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:52:01Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Installer: double free lets a local user gain higher privileges","impact":"high","summary":"A memory bug (double free) in Windows Installer lets an attacker who already has a local account raise their privileges. Nothing in the sources says how the bug is triggered beyond that.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-installer"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local attacker gains higher privileges on the Windows machine","analyst_note":"Find the Microsoft advisory for CVE-2026-119399 to confirm affected Windows versions, the fixed update, and how to check for it.","how_to_check":"- unknown","plain_action":"","product_name":"Windows Installer","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines with Windows Installer, where an attacker already has a local account. The sources do not say which Windows versions or configurations are affected, so unknown.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000657,"input_tokens":4472,"output_tokens":420,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft advisory for CVE-2026-119399 to confirm affected Windows versions, the fixed update, and how to check for it.","search":"'-119399':14A,17A '-2026':13A,16A 'account':41B 'allow':61C 'alreadi':37B 'attack':35B,64C 'author':63C 'beyond':55B 'bug':27B,52B 'cve':12A,15A 'doubl':3A,28B,56C 'elev':66C 'free':4A,29B,57C 'gain':9A 'higher':10A 'infrastructur':20B 'instal':2A,24B,32B,60C 'installer':19A 'let':5A,33B 'local':7A,40B,68C 'memori':26B 'noth':45B 'privileg':11A,44B,67C 'rais':42B 'say':49B 'sourc':48B 'trigger':54B 'user':8A 'window':1A,21B,23B,31B,59C 'windows':18A 'windows-instal':22B","nicknames":[],"mitigations":[],"who_affected":"Windows machines with Windows Installer, where an attacker already has a local account. The sources do not say which Windows versions or configurations are affected, so unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["installer","windowsinstaller"],"ptokens":["installer","windows"],"labels":["high","infrastructure","vendor","windows","windowsinstaller"],"campaign_type":null,"search_a":"'-119399':14A,17A '-2026':13A,16A 'cve':12A,15A 'doubl':3A 'free':4A 'gain':9A 'higher':10A 'instal':2A 'installer':19A 'let':5A 'local':7A 'privileg':11A 'user':8A 'window':1A 'windows':18A","search_b":"'account':41B 'alreadi':37B 'attack':35B 'beyond':55B 'bug':27B,52B 'doubl':28B 'free':29B 'infrastructur':20B 'instal':24B,32B 'let':33B 'local':40B 'memori':26B 'noth':45B 'privileg':44B 'rais':42B 'say':49B 'sourc':48B 'trigger':54B 'window':21B,23B,31B 'windows-instal':22B","search_c":"'allow':61C 'attack':64C 'author':63C 'doubl':56C 'elev':66C 'free':57C 'instal':60C 'local':68C 'privileg':67C 'window':59C","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-2026-119399","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119399","severity":null,"published_at":"2026-11-10T19:19:54+00:00","modified_at":"2026-11-10T19:19:55+00:00","first_seen_at":"2026-11-10T19:24:57+00:00","fetched_at":"2026-11-10T19:24:57+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"}