{"id":"CVE-2026-70231","kind":"vulnerability","aliases":["CVE-2026-70231"],"related":[],"title":"Windows LSASS: use-after-free lets a local user gain privileges","description":"Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to elevate privileges locally.","summary":"A use-after-free bug in the Windows Local Security Authority Subsystem Service (LSASS) lets an attacker who already has an account on the machine raise their privileges. The sources give a CVSS score of 7.0 and do not describe the exact trigger or any exploitation.","severity":"high","cvss":7.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["active-directory","infrastructure","lsass","windows"],"not_affected_if":[],"how_to_check":"- Check the Windows build with `winver` and compare it against Microsoft's security update guide entry for CVE-2026-70231","fix":null,"status":"open","published_at":"2026-11-10T19:21:20+00:00","first_seen_at":"2026-11-10T19:25:17+00:00","triaged_at":"2026-11-10T19:50:08+00:00","updated_at":"2026-11-10T19:50:08+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:50:08Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"local","title":"Windows LSASS: use-after-free lets a local user gain privileges","impact":"high","summary":"A use-after-free bug in the Windows Local Security Authority Subsystem Service (LSASS) lets an attacker who already has an account on the machine raise their privileges. The sources give a CVSS score of 7.0 and do not describe the exact trigger or any exploitation.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","lsass","active-directory"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the machine","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-70231 for affected Windows builds, the patch KB, and whether exploitation is seen.","how_to_check":"- Check the Windows build with `winver` and compare it against Microsoft's security update guide entry for CVE-2026-70231\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Any Windows machine where an authorized user can run code locally may be affected, since the flaw sits in LSASS, a core authentication component. The sources do not list affected Windows builds or whether any non-default configuration is required. Machines with no untrusted local users are at lower practical risk.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000712,"input_tokens":4501,"output_tokens":523,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-70231 for affected Windows builds, the patch KB, and whether exploitation is seen.","search":"'-2026':14A,17A '-70231':15A,18A '7.0':61B 'account':47B 'activ':20B 'active-directori':19B 'allow':83C 'alreadi':44B 'attack':42B,86C 'author':36B,79C,85C 'bug':30B 'cve':13A,16A 'cvss':58B 'describ':65B 'directori':21B 'elev':88C 'exact':67B 'exploit':71B 'free':6A,29B,74C 'gain':11A 'give':56B 'infrastructur':22B 'let':7A,40B 'local':9A,34B,77C,90C 'lsass':2A,23B,39B,82C 'machin':50B 'privileg':12A,53B,89C 'rais':51B 'score':59B 'secur':35B,78C 'servic':38B,81C 'sourc':55B 'subsystem':37B,80C 'trigger':68B 'use':4A,27B,72C 'use-after-fre':3A,26B 'user':10A 'window':1A,24B,33B,76C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine where an authorized user can run code locally may be affected, since the flaw sits in LSASS, a core authentication component. The sources do not list affected Windows builds or whether any non-default configuration is required. Machines with no untrusted local users are at lower practical risk.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["activedirectory","high","infrastructure","lsass","windows"],"campaign_type":null,"search_a":"'-2026':14A,17A '-70231':15A,18A 'cve':13A,16A 'free':6A 'gain':11A 'let':7A 'local':9A 'lsass':2A 'privileg':12A 'use':4A 'use-after-fre':3A 'user':10A 'window':1A","search_b":"'7.0':61B 'account':47B 'activ':20B 'active-directori':19B 'alreadi':44B 'attack':42B 'author':36B 'bug':30B 'cvss':58B 'describ':65B 'directori':21B 'exact':67B 'exploit':71B 'free':29B 'give':56B 'infrastructur':22B 'let':40B 'local':34B 'lsass':23B,39B 'machin':50B 'privileg':53B 'rais':51B 'score':59B 'secur':35B 'servic':38B 'sourc':55B 'subsystem':37B 'trigger':68B 'use':27B 'use-after-fre':26B 'window':24B,33B","search_c":"'allow':83C 'attack':86C 'author':79C,85C 'elev':88C 'free':74C 'local':77C,90C 'lsass':82C 'privileg':89C 'secur':78C 'servic':81C 'subsystem':80C 'use':72C 'window':76C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:20+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-2026-70231","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70231","severity":null,"published_at":"2026-11-10T19:21:20+00:00","modified_at":"2026-11-10T19:21:21+00:00","first_seen_at":"2026-11-10T19:25:17+00:00","fetched_at":"2026-11-10T19:25:17+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"}