{"id":"CVE-2026-112809","kind":"vulnerability","aliases":["CVE-2026-112809"],"related":[],"title":"Windows Composite Image File System: local user can disclose information","description":"Improper access control in Windows Composite Image File System allows an authorized attacker to disclose information locally.","summary":"Windows Composite Image File System has an access control flaw that lets an authorized local user read information they should not see. The attacker needs a local account on the affected machine.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows"],"not_affected_if":["no-local-users"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:45+00:00","first_seen_at":"2026-11-10T19:24:34+00:00","triaged_at":"2026-11-10T20:02:09+00:00","updated_at":"2026-11-10T20:02:09+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T20:02:09Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Composite Image File System: local user can disclose information","impact":"low","summary":"Windows Composite Image File System has an access control flaw that lets an authorized local user read information they should not see. The attacker needs a local account on the affected machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user reads information they should not access","analyst_note":"Find the Microsoft advisory for CVE-2026-112809 to get affected Windows builds and the fixed update.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-users"],"who_is_affected":"Only Windows machines that run the Composite Image File System component are described; the sources do not list affected builds. An attacker must already be an authorized local user, so shared or multi-user Windows hosts are the main concern. unknown","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000641,"input_tokens":4480,"output_tokens":385,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-112809':13A,16A '-2026':12A,15A 'access':26B,52C 'account':46B 'affect':49B 'allow':60C 'attack':42B,63C 'author':32B,62C 'composit':2A,20B,56C 'control':27B,53C 'cve':11A,14A 'disclos':9A,65C 'file':4A,22B,58C 'flaw':28B 'imag':3A,21B,57C 'improp':51C 'inform':10A,36B,66C 'infrastructur':17B 'let':30B 'local':6A,33B,45B,67C 'machin':50B 'need':43B 'read':35B 'see':40B 'system':5A,23B,59C 'user':7A,34B 'window':1A,18B,19B,55C","nicknames":[],"mitigations":[],"who_affected":"Only Windows machines that run the Composite Image File System component are described; the sources do not list affected builds. An attacker must already be an authorized local user, so shared or multi-user Windows hosts are the main concern. unknown","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","medium","windows"],"campaign_type":null,"search_a":"'-112809':13A,16A '-2026':12A,15A 'composit':2A 'cve':11A,14A 'disclos':9A 'file':4A 'imag':3A 'inform':10A 'local':6A 'system':5A 'user':7A 'window':1A","search_b":"'access':26B 'account':46B 'affect':49B 'attack':42B 'author':32B 'composit':20B 'control':27B 'file':22B 'flaw':28B 'imag':21B 'inform':36B 'infrastructur':17B 'let':30B 'local':33B,45B 'machin':50B 'need':43B 'read':35B 'see':40B 'system':23B 'user':34B 'window':18B,19B","search_c":"'access':52C 'allow':60C 'attack':63C 'author':62C 'composit':56C 'control':53C 'disclos':65C 'file':58C 'imag':57C 'improp':51C 'inform':66C 'local':67C 'system':59C 'window':55C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:45+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-2026-112809","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112809","severity":null,"published_at":"2026-11-10T19:18:45+00:00","modified_at":"2026-11-10T19:18:45+00:00","first_seen_at":"2026-11-10T19:24:34+00:00","fetched_at":"2026-11-10T19:24:34+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"}