{"id":"CVE-2026-96018","kind":"vulnerability","aliases":["CVE-2026-96018"],"related":[],"title":"Windows AppContainer: weak authentication lets a local user disclose information","description":"Weak authentication in Windows AppContainer allows an authorized attacker to disclose information locally.","summary":"Windows AppContainer has a weak authentication flaw that lets an already-authorized attacker read information on the same machine. The sources report only local information disclosure and do not describe the exact data exposed.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["appcontainer","infrastructure","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:58+00:00","first_seen_at":"2026-11-10T19:25:27+00:00","triaged_at":"2026-11-10T19:56:08+00:00","updated_at":"2026-11-10T19:56:08+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:56:08Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows AppContainer: weak authentication lets a local user disclose information","impact":"low","summary":"Windows AppContainer has a weak authentication flaw that lets an already-authorized attacker read information on the same machine. The sources report only local information disclosure and do not describe the exact data exposed.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","appcontainer"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local attacker reads information it should not access","analyst_note":"Check the Microsoft security update guide entry for CVE-2026-96018 for affected Windows builds, the fixed update and what information is disclosed.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines where an attacker already has a local authorized account or code running on the system could read information through AppContainer. The sources do not name affected Windows builds or the default configuration, so unknown.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00065,"input_tokens":4479,"output_tokens":404,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-96018':13A,16A 'allow':60C 'alreadi':31B 'already-author':30B 'appcontain':2A,17B,21B,59C 'attack':33B,63C 'authent':4A,25B,56C 'author':32B,62C 'cve':11A,14A 'data':53B 'describ':50B 'disclos':9A,65C 'disclosur':46B 'exact':52B 'expos':54B 'flaw':26B 'inform':10A,35B,45B,66C 'infrastructur':18B 'let':5A,28B 'local':7A,44B,67C 'machin':39B 'read':34B 'report':42B 'sourc':41B 'user':8A 'weak':3A,24B,55C 'window':1A,19B,20B,58C","nicknames":[],"mitigations":[],"who_affected":"Windows machines where an attacker already has a local authorized account or code running on the system could read information through AppContainer. The sources do not name affected Windows builds or the default configuration, so unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["appcontainer","infrastructure","medium","windows"],"campaign_type":null,"search_a":"'-2026':12A,15A '-96018':13A,16A 'appcontain':2A 'authent':4A 'cve':11A,14A 'disclos':9A 'inform':10A 'let':5A 'local':7A 'user':8A 'weak':3A 'window':1A","search_b":"'alreadi':31B 'already-author':30B 'appcontain':17B,21B 'attack':33B 'authent':25B 'author':32B 'data':53B 'describ':50B 'disclosur':46B 'exact':52B 'expos':54B 'flaw':26B 'inform':35B,45B 'infrastructur':18B 'let':28B 'local':44B 'machin':39B 'read':34B 'report':42B 'sourc':41B 'weak':24B 'window':19B,20B","search_c":"'allow':60C 'appcontain':59C 'attack':63C 'authent':56C 'author':62C 'disclos':65C 'inform':66C 'local':67C 'weak':55C 'window':58C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:58+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-96018","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96018","severity":null,"published_at":"2026-11-10T19:21:58+00:00","modified_at":"2026-11-10T19:21:58+00:00","first_seen_at":"2026-11-10T19:25:27+00:00","fetched_at":"2026-11-10T19:25:27+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"}