{"id":"CVE-2026-88227","kind":"vulnerability","aliases":["CVE-2026-88227"],"related":[],"title":"Windows LSASS: heap overflow lets a local user gain higher privileges","description":"Heap-based buffer overflow in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to elevate privileges locally.","summary":"A heap-based buffer overflow in the Windows Local Security Authority Subsystem Service (LSASS) lets an authorized local attacker elevate their privileges. Successful exploitation gives the attacker control over a privileged system component on the same machine.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","lsass","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:30+00:00","first_seen_at":"2026-11-10T19:25:19+00:00","triaged_at":"2026-11-10T19:38:42+00:00","updated_at":"2026-11-10T19:38:42+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:38:42Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows LSASS: heap overflow lets a local user gain higher privileges","impact":"high","summary":"A heap-based buffer overflow in the Windows Local Security Authority Subsystem Service (LSASS) lets an authorized local attacker elevate their privileges. Successful exploitation gives the attacker control over a privileged system component on the same machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","lsass"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user becomes SYSTEM-level administrator on the machine","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-88227 to confirm affected Windows builds, the fixed update, and whether it is exploited.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Any Windows machine where a user already has a local login can be affected, since the attacker must be authorized on the system first. Servers and multi-user workstations carry the most risk. unknown","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000668,"input_tokens":4511,"output_tokens":433,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-88227 to confirm affected Windows builds, the fixed update, and whether it is exploited.","search":"'-2026':13A,16A '-88227':14A,17A 'allow':72C 'attack':40B,48B,75C 'author':32B,38B,68C,74C 'base':24B,61C 'buffer':25B,62C 'compon':54B 'control':49B 'cve':12A,15A 'elev':41B,77C 'exploit':45B 'gain':9A 'give':46B 'heap':3A,23B,60C 'heap-bas':22B,59C 'higher':10A 'infrastructur':18B 'let':5A,36B 'local':7A,30B,39B,66C,79C 'lsass':2A,19B,35B,71C 'machin':58B 'overflow':4A,26B,63C 'privileg':11A,43B,52B,78C 'secur':31B,67C 'servic':34B,70C 'subsystem':33B,69C 'success':44B 'system':53B 'user':8A 'window':1A,20B,29B,65C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine where a user already has a local login can be affected, since the attacker must be authorized on the system first. Servers and multi-user workstations carry the most risk. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","lsass","windows"],"campaign_type":null,"search_a":"'-2026':13A,16A '-88227':14A,17A 'cve':12A,15A 'gain':9A 'heap':3A 'higher':10A 'let':5A 'local':7A 'lsass':2A 'overflow':4A 'privileg':11A 'user':8A 'window':1A","search_b":"'attack':40B,48B 'author':32B,38B 'base':24B 'buffer':25B 'compon':54B 'control':49B 'elev':41B 'exploit':45B 'give':46B 'heap':23B 'heap-bas':22B 'infrastructur':18B 'let':36B 'local':30B,39B 'lsass':19B,35B 'machin':58B 'overflow':26B 'privileg':43B,52B 'secur':31B 'servic':34B 'subsystem':33B 'success':44B 'system':53B 'window':20B,29B","search_c":"'allow':72C 'attack':75C 'author':68C,74C 'base':61C 'buffer':62C 'elev':77C 'heap':60C 'heap-bas':59C 'local':66C,79C 'lsass':71C 'overflow':63C 'privileg':78C 'secur':67C 'servic':70C 'subsystem':69C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:30+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-2026-88227","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88227","severity":null,"published_at":"2026-11-10T19:21:30+00:00","modified_at":"2026-11-10T19:21:31+00:00","first_seen_at":"2026-11-10T19:25:19+00:00","fetched_at":"2026-11-10T19:25:19+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"}