{"id":"CVE-2026-96036","kind":"vulnerability","aliases":["CVE-2026-96036"],"related":[],"title":"Windows Installer: integer overflow lets a local user gain higher privileges","description":"Integer overflow or wraparound in Windows Installer allows an authorized attacker to elevate privileges locally.","summary":"A flaw in Windows Installer, the component that installs and removes Windows software, lets an attacker who already has a local account raise their privileges. The sources do not describe the exact trigger, so the precise exploit path is unknown.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","local-privilege-escalation","windows","windows-installer"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":"Unknown: affected Windows builds and KB not obtained. Check the MSRC Security Update Guide entry for CVE-2026-96036 and compare installed KBs (Get-HotFix) against it.","fix":null,"status":"open","published_at":"2026-11-10T19:22:00+00:00","first_seen_at":"2026-11-10T19:25:28+00:00","triaged_at":"2026-11-10T19:36:48+00:00","updated_at":"2026-11-10T20:04:39+00:00","category":"infrastructure","confidence":0.3,"triage":{"at":"2026-11-10T19:36:48Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"local","title":"Windows Installer: integer overflow lets a local user gain higher privileges","impact":"high","summary":"A flaw in Windows Installer, the component that installs and removes Windows software, lets an attacker who already has a local account raise their privileges. The sources do not describe the exact trigger, so the precise exploit path is unknown.","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 privileges on the Windows machine","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-96036 for affected Windows builds, the patch KB, and any mitigation.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Any Windows machine with the Windows Installer service is in scope, and shared or multi-user Windows systems carry the most risk because the attacker must already hold a local account. The sources do not list affected Windows builds or whether any non-default configuration is required. Systems where only a single trusted user logs in are lower risk.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000688,"input_tokens":4488,"output_tokens":478,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-96036 for affected Windows builds, the patch KB, and any mitigation.","search":"'-2026':13A,16A '-96036':14A,17A 'account':48B 'allow':74C 'alreadi':44B 'attack':42B,77C 'author':76C 'compon':33B 'cve':12A,15A 'describ':56B 'elev':79C 'escal':22B 'exact':58B 'exploit':63B 'flaw':28B 'gain':9A 'higher':10A 'infrastructur':18B 'instal':2A,26B,31B,35B,73C 'integ':3A,67C 'let':5A,40B 'local':7A,20B,47B,81C 'local-privilege-escal':19B 'overflow':4A,68C 'path':64B 'precis':62B 'privileg':11A,21B,51B,80C 'rais':49B 'remov':37B 'softwar':39B 'sourc':53B 'trigger':59B 'unknown':66B 'user':8A 'window':1A,23B,25B,30B,38B,72C 'windows-instal':24B 'wraparound':70C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine with the Windows Installer service is in scope, and shared or multi-user Windows systems carry the most risk because the attacker must already hold a local account. The sources do not list affected Windows builds or whether any non-default configuration is required. Systems where only a single trusted user logs in are lower risk.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","localprivilegeescalation","windows","windowsinstaller"],"campaign_type":null,"search_a":"'-2026':13A,16A '-96036':14A,17A 'cve':12A,15A 'gain':9A 'higher':10A 'instal':2A 'integ':3A 'let':5A 'local':7A 'overflow':4A 'privileg':11A 'user':8A 'window':1A","search_b":"'account':48B 'alreadi':44B 'attack':42B 'compon':33B 'describ':56B 'escal':22B 'exact':58B 'exploit':63B 'flaw':28B 'infrastructur':18B 'instal':26B,31B,35B 'let':40B 'local':20B,47B 'local-privilege-escal':19B 'path':64B 'precis':62B 'privileg':21B,51B 'rais':49B 'remov':37B 'softwar':39B 'sourc':53B 'trigger':59B 'unknown':66B 'window':23B,25B,30B,38B 'windows-instal':24B","search_c":"'allow':74C 'attack':77C 'author':76C 'elev':79C 'instal':73C 'integ':67C 'local':81C 'overflow':68C 'privileg':80C 'window':72C 'wraparound':70C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:22:00+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-2026-96036","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96036","severity":null,"published_at":"2026-11-10T19:22:00+00:00","modified_at":"2026-11-10T19:22:00+00:00","first_seen_at":"2026-11-10T19:25:28+00:00","fetched_at":"2026-11-10T19:25:28+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-96036:2601","url":null,"severity":null,"published_at":"2026-11-10T20:04:39+00:00","modified_at":"2026-11-10T20:04:39+00:00","first_seen_at":"2026-11-10T20:04:39+00:00","fetched_at":"2026-11-10T20:04:39+00:00","note":"Could not read MSRC (JS page, empty via web-cli), NVD (WebFetch returned only home page), cve.org (empty record) or API; no primary content obtained, so no versions, KB or mitigation. Nothing verified. Needs revisit when MSRC page is readable (check Nov 2026 Patch Tuesday KBs)."}],"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"}