{"id":"CVE-2026-119883","kind":"vulnerability","aliases":["CVE-2026-119883"],"related":[],"title":"Windows Data Deduplication: local authorized user can bypass a security feature","description":"Improper authorization in Data Deduplication allows an authorized attacker to bypass a security feature locally.","summary":"Data Deduplication, a Windows Server storage feature, has an improper authorization flaw. A local user who already has an account can bypass a security feature on the machine.","severity":"low","cvss":3.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["data-deduplication","infrastructure","windows","windows-server"],"not_affected_if":["feature-not-enabled"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:20:07+00:00","first_seen_at":"2026-11-10T19:25:01+00:00","triaged_at":"2026-11-10T20:04:36+00:00","updated_at":"2026-11-10T20:04:36+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T20:04:36Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Data Deduplication: local authorized user can bypass a security feature","impact":"low","summary":"Data Deduplication, a Windows Server storage feature, has an improper authorization flaw. A local user who already has an account can bypass a security feature on the machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-server","data-deduplication"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local authorized user bypasses a security feature on the host","analyst_note":"Confirm affected Windows versions and the fixed update from the Microsoft Security Response Center advisory for CVE-2026-119883.","how_to_check":"- unknown","plain_action":"","product_name":"Windows Data Deduplication","needs_analyst":true,"not_affected_if":["feature-not-enabled"],"who_is_affected":"Systems running Windows with the Data Deduplication feature enabled may be exposed; the sources do not name the affected versions. Machines without Data Deduplication enabled can likely skip it. The sources do not say more.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000672,"input_tokens":4482,"output_tokens":448,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-119883':14A,17A '-2026':13A,16A 'account':45B 'allow':59C 'alreadi':42B 'attack':62C 'author':5A,36B,55C,61C 'bypass':8A,47B,64C 'cve':12A,15A 'data':2A,19B,26B,57C 'data-dedupl':18B 'dedupl':3A,20B,27B,58C 'featur':11A,32B,50B,67C 'flaw':37B 'improp':35B,54C 'infrastructur':21B 'local':4A,39B,68C 'machin':53B 'secur':10A,49B,66C 'server':25B,30B 'storag':31B 'user':6A,40B 'window':1A,22B,24B,29B 'windows-serv':23B","nicknames":[],"mitigations":[],"who_affected":"Systems running Windows with the Data Deduplication feature enabled may be exposed; the sources do not name the affected versions. Machines without Data Deduplication enabled can likely skip it. The sources do not say more.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["datadeduplication","infrastructure","low","windows","windowsserver"],"campaign_type":null,"search_a":"'-119883':14A,17A '-2026':13A,16A 'author':5A 'bypass':8A 'cve':12A,15A 'data':2A 'dedupl':3A 'featur':11A 'local':4A 'secur':10A 'user':6A 'window':1A","search_b":"'account':45B 'alreadi':42B 'author':36B 'bypass':47B 'data':19B,26B 'data-dedupl':18B 'dedupl':20B,27B 'featur':32B,50B 'flaw':37B 'improp':35B 'infrastructur':21B 'local':39B 'machin':53B 'secur':49B 'server':25B,30B 'storag':31B 'user':40B 'window':22B,24B,29B 'windows-serv':23B","search_c":"'allow':59C 'attack':62C 'author':55C,61C 'bypass':64C 'data':57C 'dedupl':58C 'featur':67C 'improp':54C 'local':68C 'secur':66C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:07+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119883","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119883","severity":null,"published_at":"2026-11-10T19:20:07+00:00","modified_at":"2026-11-10T19:20:08+00:00","first_seen_at":"2026-11-10T19:25:01+00:00","fetched_at":"2026-11-10T19:25:01+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"}