{"id":"CVE-2026-88228","kind":"vulnerability","aliases":["CVE-2026-88228"],"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 user elevate their privileges. An attacker who already has a login on the machine could gain system-level control.","severity":"high","cvss":7.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","local-users","lsass","windows"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:31+00:00","first_seen_at":"2026-11-10T19:25:19+00:00","triaged_at":"2026-11-10T19:50:02+00:00","updated_at":"2026-11-10T19:50:02+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:50:02Z","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 user elevate their privileges. An attacker who already has a login on the machine could gain system-level control.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","lsass","local-users"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user escalates to full system control","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-88228 to get affected builds, the fixed update, and any exploitation details.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Systems running Windows where LSASS is present, which is every Windows machine. Exposure requires an attacker who already has an authorized local account, so shared or multi-user hosts carry the most risk. The sources do not state which Windows builds are affected.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000675,"input_tokens":4511,"output_tokens":447,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-88228 to get affected builds, the fixed update, and any exploitation details.","search":"'-2026':13A,16A '-88228':14A,17A 'allow':76C 'alreadi':50B 'attack':48B,79C 'author':35B,41B,72C,78C 'base':27B,65C 'buffer':28B,66C 'control':62B 'could':57B 'cve':12A,15A 'elev':44B,81C 'gain':9A,58B 'heap':3A,26B,64C 'heap-bas':25B,63C 'higher':10A 'infrastructur':18B 'let':5A,39B 'level':61B 'local':7A,20B,33B,42B,70C,83C 'local-us':19B 'login':53B 'lsass':2A,22B,38B,75C 'machin':56B 'overflow':4A,29B,67C 'privileg':11A,46B,82C 'secur':34B,71C 'servic':37B,74C 'subsystem':36B,73C 'system':60B 'system-level':59B 'user':8A,21B,43B 'window':1A,23B,32B,69C","nicknames":[],"mitigations":[],"who_affected":"Systems running Windows where LSASS is present, which is every Windows machine. Exposure requires an attacker who already has an authorized local account, so shared or multi-user hosts carry the most risk. The sources do not state which Windows builds are affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","localusers","lsass","windows"],"campaign_type":null,"search_a":"'-2026':13A,16A '-88228':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":"'alreadi':50B 'attack':48B 'author':35B,41B 'base':27B 'buffer':28B 'control':62B 'could':57B 'elev':44B 'gain':58B 'heap':26B 'heap-bas':25B 'infrastructur':18B 'let':39B 'level':61B 'local':20B,33B,42B 'local-us':19B 'login':53B 'lsass':22B,38B 'machin':56B 'overflow':29B 'privileg':46B 'secur':34B 'servic':37B 'subsystem':36B 'system':60B 'system-level':59B 'user':21B,43B 'window':23B,32B","search_c":"'allow':76C 'attack':79C 'author':72C,78C 'base':65C 'buffer':66C 'elev':81C 'heap':64C 'heap-bas':63C 'local':70C,83C 'lsass':75C 'overflow':67C 'privileg':82C 'secur':71C 'servic':74C 'subsystem':73C 'window':69C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:31+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-2026-88228","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88228","severity":null,"published_at":"2026-11-10T19:21:31+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"}