{"id":"CVE-2026-96989","kind":"vulnerability","aliases":["CVE-2026-96989"],"related":[],"title":"Windows: Secondary Logon out-of-bounds read leaks data to local users","description":"Out-of-bounds read in Secondary Logon allows an authorized attacker to disclose information locally.","summary":"Secondary Logon, the Windows service behind RunAs, has an out-of-bounds read that an authorized local user can trigger. An attacker with a local account can read memory they should not see, which may disclose information.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","secondary-logon","windows"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:22:22+00:00","first_seen_at":"2026-11-10T19:25:34+00:00","triaged_at":"2026-11-10T20:00:17+00:00","updated_at":"2026-11-10T20:00:17+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T20:00:17Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows: Secondary Logon out-of-bounds read leaks data to local users","impact":"low","summary":"Secondary Logon, the Windows service behind RunAs, has an out-of-bounds read that an authorized local user can trigger. An attacker with a local account can read memory they should not see, which may disclose information.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","secondary-logon"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user reads memory it should not access","analyst_note":"Check the Microsoft security update guide for CVE-2026-96989 for affected Windows builds and the patch; the NVD entry has no product or fix data.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Only local users who already have an account on the affected Windows machine can trigger this, since it is a local information disclosure. The sources do not name the affected Windows builds or list a fixed version. Servers with few local accounts or tightly controlled logons are lower risk.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000671,"input_tokens":4483,"output_tokens":446,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-96989':16A,19A 'account':51B 'allow':71C 'attack':47B,74C 'author':41B,73C 'behind':30B 'bound':7A,37B,66C 'cve':14A,17A 'data':10A 'disclos':61B,76C 'inform':62B,77C 'infrastructur':20B 'leak':9A 'local':12A,42B,50B,78C 'logon':3A,23B,26B,70C 'may':60B 'memori':54B 'out-of-bound':4A,34B,63C 'read':8A,38B,53B,67C 'runa':31B 'secondari':2A,22B,25B,69C 'secondary-logon':21B 'see':58B 'servic':29B 'trigger':45B 'user':13A,43B 'window':1A,24B,28B","nicknames":[],"mitigations":[],"who_affected":"Only local users who already have an account on the affected Windows machine can trigger this, since it is a local information disclosure. The sources do not name the affected Windows builds or list a fixed version. Servers with few local accounts or tightly controlled logons are lower risk.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","medium","secondarylogon","windows"],"campaign_type":null,"search_a":"'-2026':15A,18A '-96989':16A,19A 'bound':7A 'cve':14A,17A 'data':10A 'leak':9A 'local':12A 'logon':3A 'out-of-bound':4A 'read':8A 'secondari':2A 'user':13A 'window':1A","search_b":"'account':51B 'attack':47B 'author':41B 'behind':30B 'bound':37B 'disclos':61B 'inform':62B 'infrastructur':20B 'local':42B,50B 'logon':23B,26B 'may':60B 'memori':54B 'out-of-bound':34B 'read':38B,53B 'runa':31B 'secondari':22B,25B 'secondary-logon':21B 'see':58B 'servic':29B 'trigger':45B 'user':43B 'window':24B,28B","search_c":"'allow':71C 'attack':74C 'author':73C 'bound':66C 'disclos':76C 'inform':77C 'local':78C 'logon':70C 'out-of-bound':63C 'read':67C 'secondari':69C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:22:22+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-96989","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96989","severity":null,"published_at":"2026-11-10T19:22:22+00:00","modified_at":"2026-11-10T19:22:22+00:00","first_seen_at":"2026-11-10T19:25:34+00:00","fetched_at":"2026-11-10T19:25:34+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"}