{"id":"CVE-2026-96004","kind":"vulnerability","aliases":["CVE-2026-96004"],"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 use-after-free bug in Windows Installer lets an authorized local user raise their privileges. An attacker who already has a foothold on the machine could gain administrator-level control.","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":"Unknown from sources read. Compare the OS build (winver or Get-ComputerInfo) and installed KBs against the Microsoft Security Update Guide entry for CVE-2026-96004 (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96004); affected builds and KB numbers were not retrievable.","fix":null,"status":"open","published_at":"2026-11-10T19:21:57+00:00","first_seen_at":"2026-11-10T19:25:26+00:00","triaged_at":"2026-11-10T19:49:38+00:00","updated_at":"2026-11-10T20:11:04+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T19:49:38Z","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 use-after-free bug in Windows Installer lets an authorized local user raise their privileges. An attacker who already has a foothold on the machine could gain administrator-level control.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-installer"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains administrator privileges on the machine","analyst_note":"Confirm affected Windows builds and the Microsoft patch from the MSRC advisory for CVE-2026-96004.","how_to_check":"unknown","plain_action":"","product_name":"Windows Installer","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines where a local user with a basic account can run Windows Installer. The sources do not list affected Windows builds or whether a patch exists, so check Microsoft's security update guide for this CVE.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000659,"input_tokens":4474,"output_tokens":423,"severity_before":"high"},"analyst_status":"done","analyst_note":"Confirm affected Windows builds and the Microsoft patch from the MSRC advisory for CVE-2026-96004.","search":"'-2026':15A,18A '-96004':16A,19A 'administr':57B 'administrator-level':56B 'allow':66C 'alreadi':47B 'attack':45B,69C 'author':38B,68C 'bug':32B 'control':59B 'could':54B 'cve':14A,17A 'elev':71C 'foothold':50B 'free':6A,31B,62C 'gain':11A,55B 'higher':12A 'infrastructur':22B 'instal':2A,26B,35B,65C 'installer':21A 'let':7A,36B 'level':58B 'local':9A,39B,73C 'machin':53B 'privileg':13A,43B,72C 'rais':41B 'use':4A,29B,60C 'use-after-fre':3A,28B 'user':10A,40B 'window':1A,23B,25B,34B,64C 'windows':20A 'windows-instal':24B","nicknames":[],"mitigations":[],"who_affected":"Windows machines where a local user with a basic account can run Windows Installer. The sources do not list affected Windows builds or whether a patch exists, so check Microsoft's security update guide for this CVE.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":["installer","windowsinstaller"],"ptokens":["installer","windows"],"labels":["high","infrastructure","vendor","windows","windowsinstaller"],"campaign_type":null,"search_a":"'-2026':15A,18A '-96004':16A,19A 'cve':14A,17A 'free':6A 'gain':11A 'higher':12A 'instal':2A 'installer':21A 'let':7A 'local':9A 'privileg':13A 'use':4A 'use-after-fre':3A 'user':10A 'window':1A 'windows':20A","search_b":"'administr':57B 'administrator-level':56B 'alreadi':47B 'attack':45B 'author':38B 'bug':32B 'control':59B 'could':54B 'foothold':50B 'free':31B 'gain':55B 'infrastructur':22B 'instal':26B,35B 'let':36B 'level':58B 'local':39B 'machin':53B 'privileg':43B 'rais':41B 'use':29B 'use-after-fre':28B 'user':40B 'window':23B,25B,34B 'windows-instal':24B","search_c":"'allow':66C 'attack':69C 'author':68C 'elev':71C 'free':62C 'instal':65C 'local':73C 'privileg':72C 'use':60C 'window':64C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:57+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-2026-96004","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96004","severity":null,"published_at":"2026-11-10T19:21:57+00:00","modified_at":"2026-11-10T19:21:57+00:00","first_seen_at":"2026-11-10T19:25:26+00:00","fetched_at":"2026-11-10T19:25:26+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-96004:2619","url":null,"severity":null,"published_at":"2026-11-10T20:11:04+00:00","modified_at":"2026-11-10T20:11:04+00:00","first_seen_at":"2026-11-10T20:11:04+00:00","fetched_at":"2026-11-10T20:11:04+00:00","note":"MSRC page is JS-only and returned nothing; the CVRF API gave no data; no primary doc linked. NVD says: Windows Installer UAF, local EoP, CVSS 7.0 (AV:L/AC:H/PR:L), Microsoft-scored. No exploitation or PoC known. Affected builds and patch KB unknown; settle by reading the MSRC page in a browser or the November 2026 CVRF. web-cli search found only sibling Windows Installer CVEs (CVE-2026-69441, Sept) and no x-cli check done (low value for local EoP)."}],"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"}