{"id":"CVE-2026-96066","kind":"vulnerability","aliases":["CVE-2026-96066"],"related":[],"title":"Windows LSASS: stack buffer overflow lets a local user gain higher privileges","description":"Stack-based buffer overflow in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to elevate privileges locally.","summary":"A stack-based buffer overflow in the Windows Local Security Authority Subsystem Service (LSASS) lets an authorized local attacker elevate their privileges. The NVD record rates it high, with a CVSS score of 7.8.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["endpoints","infrastructure","local-privilege-escalation","lsass","windows"],"not_affected_if":["no-local-access","no-local-accounts"],"how_to_check":"unknown: affected Windows builds not yet read from Microsoft. Look up CVE-2026-96066 in the MSRC Security Update Guide for your build and compare with the installed KB (winver, Get-HotFix).","fix":null,"status":"open","published_at":"2026-11-10T19:22:04+00:00","first_seen_at":"2026-11-10T19:25:29+00:00","triaged_at":"2026-11-10T19:36:35+00:00","updated_at":"2026-11-10T19:56:56+00:00","category":"infrastructure","confidence":0.3,"triage":{"at":"2026-11-10T19:36:35Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows LSASS: stack buffer overflow lets a local user gain higher privileges","impact":"high","summary":"A stack-based buffer overflow in the Windows Local Security Authority Subsystem Service (LSASS) lets an authorized local attacker elevate their privileges. The NVD record rates it high, with a CVSS score of 7.8.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","lsass","endpoints"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the machine","analyst_note":"Find the affected Windows builds and the Microsoft patch from the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-96066 or the Microsoft Security Update Guide.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-accounts"],"who_is_affected":"Any Windows machine that runs LSASS is in scope, which means every Windows system. The attacker needs a local account on the machine first, so exposure depends on who can log on locally. The sources do not name affected Windows builds or a patch.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000691,"input_tokens":4511,"output_tokens":480,"severity_before":"high"},"analyst_status":"done","analyst_note":"Find the affected Windows builds and the Microsoft patch from the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-96066 or the Microsoft Security Update Guide.","search":"'-2026':14A,17A '-96066':15A,18A '7.8':61B 'allow':75C 'attack':46B,78C 'author':38B,44B,71C,77C 'base':30B,64C 'buffer':4A,31B,65C 'cve':13A,16A 'cvss':58B 'elev':47B,80C 'endpoint':19B 'escal':24B 'gain':10A 'high':55B 'higher':11A 'infrastructur':20B 'let':6A,42B 'local':8A,22B,36B,45B,69C,82C 'local-privilege-escal':21B 'lsass':2A,25B,41B,74C 'nvd':51B 'overflow':5A,32B,66C 'privileg':12A,23B,49B,81C 'rate':53B 'record':52B 'score':59B 'secur':37B,70C 'servic':40B,73C 'stack':3A,29B,63C 'stack-bas':28B,62C 'subsystem':39B,72C 'user':9A 'window':1A,26B,35B,68C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine that runs LSASS is in scope, which means every Windows system. The attacker needs a local account on the machine first, so exposure depends on who can log on locally. The sources do not name affected Windows builds or a patch.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["endpoints","high","infrastructure","localprivilegeescalation","lsass","windows"],"campaign_type":null,"search_a":"'-2026':14A,17A '-96066':15A,18A 'buffer':4A 'cve':13A,16A 'gain':10A 'higher':11A 'let':6A 'local':8A 'lsass':2A 'overflow':5A 'privileg':12A 'stack':3A 'user':9A 'window':1A","search_b":"'7.8':61B 'attack':46B 'author':38B,44B 'base':30B 'buffer':31B 'cvss':58B 'elev':47B 'endpoint':19B 'escal':24B 'high':55B 'infrastructur':20B 'let':42B 'local':22B,36B,45B 'local-privilege-escal':21B 'lsass':25B,41B 'nvd':51B 'overflow':32B 'privileg':23B,49B 'rate':53B 'record':52B 'score':59B 'secur':37B 'servic':40B 'stack':29B 'stack-bas':28B 'subsystem':39B 'window':26B,35B","search_c":"'allow':75C 'attack':78C 'author':71C,77C 'base':64C 'buffer':65C 'elev':80C 'local':69C,82C 'lsass':74C 'overflow':66C 'privileg':81C 'secur':70C 'servic':73C 'stack':63C 'stack-bas':62C 'subsystem':72C 'window':68C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:22:04+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-2026-96066","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96066","severity":null,"published_at":"2026-11-10T19:22:04+00:00","modified_at":"2026-11-10T19:22:04+00:00","first_seen_at":"2026-11-10T19:25:29+00:00","fetched_at":"2026-11-10T19:25:29+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-96066:2581","url":null,"severity":null,"published_at":"2026-11-10T19:56:56+00:00","modified_at":"2026-11-10T19:56:56+00:00","first_seen_at":"2026-11-10T19:56:56+00:00","fetched_at":"2026-11-10T19:56:56+00:00","note":"Could not read primary source: MSRC page is JS-only (web-cli returned a loading shell), NVD page returned empty, browser-cli is out of quota. No affected builds, KB or fixed versions found; nothing verified. Settle by opening the MSRC Security Update Guide entry for CVE-2026-96066 (November 2026 Patch Tuesday, per BleepingComputer, may include it, but not confirmed). No exploitation or PoC evidence found."}],"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"}