{"id":"CVE-2026-108406","kind":"vulnerability","aliases":["CVE-2026-108406"],"related":[],"title":"Windows Network Connection Broker use-after-free lets local users gain higher privileges","description":"Use after free in Windows Network Connection Broker allows an authorized attacker to elevate privileges locally.","summary":"A use-after-free bug in the Windows Network Connection Broker component lets an attacker who already has a local account elevate their privileges. The sources give no further detail on the trigger or the affected Windows builds.","severity":"high","cvss":7.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","network-connection-broker","windows"],"not_affected_if":["unknown"],"how_to_check":"- Check the Windows build with `winver` and compare it against Microsoft's security update guide for CVE-2026-108406","fix":null,"status":"open","published_at":"2026-11-10T19:18:09+00:00","first_seen_at":"2026-11-10T19:24:22+00:00","triaged_at":"2026-11-10T19:53:53+00:00","updated_at":"2026-11-10T19:53:53+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:53:53Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Network Connection Broker use-after-free lets local users gain higher privileges","impact":"high","summary":"A use-after-free bug in the Windows Network Connection Broker component lets an attacker who already has a local account elevate their privileges. The sources give no further detail on the trigger or the affected Windows builds.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","network-connection-broker"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM-level control of the Windows machine","analyst_note":"Confirm affected Windows builds and the patch KB from Microsoft's security update guide entry for CVE-2026-108406.","how_to_check":"- Check the Windows build with `winver` and compare it against Microsoft's security update guide for CVE-2026-108406\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Any Windows machine with the Network Connection Broker component could be exposed to a local user escalating privileges. Shared multi-user systems and terminal servers carry the most risk because more people hold local accounts there. The sources do not name the affected Windows builds.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000689,"input_tokens":4484,"output_tokens":481,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Confirm affected Windows builds and the patch KB from Microsoft's security update guide entry for CVE-2026-108406.","search":"'-108406':17A,20A '-2026':16A,19A 'account':48B 'affect':63B 'allow':74C 'alreadi':44B 'attack':42B,77C 'author':76C 'broker':4A,25B,38B,73C 'bug':32B 'build':65B 'compon':39B 'connect':3A,24B,37B,72C 'cve':15A,18A 'detail':57B 'elev':49B,79C 'free':8A,31B,68C 'gain':12A 'give':54B 'higher':13A 'infrastructur':21B 'let':9A,40B 'local':10A,47B,81C 'network':2A,23B,36B,71C 'network-connection-brok':22B 'privileg':14A,51B,80C 'sourc':53B 'trigger':60B 'use':6A,29B,66C 'use-after-fre':5A,28B 'user':11A 'window':1A,26B,35B,64B,70C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine with the Network Connection Broker component could be exposed to a local user escalating privileges. Shared multi-user systems and terminal servers carry the most risk because more people hold local accounts there. The sources do not name the affected Windows builds.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","networkconnectionbroker","windows"],"campaign_type":null,"search_a":"'-108406':17A,20A '-2026':16A,19A 'broker':4A 'connect':3A 'cve':15A,18A 'free':8A 'gain':12A 'higher':13A 'let':9A 'local':10A 'network':2A 'privileg':14A 'use':6A 'use-after-fre':5A 'user':11A 'window':1A","search_b":"'account':48B 'affect':63B 'alreadi':44B 'attack':42B 'broker':25B,38B 'bug':32B 'build':65B 'compon':39B 'connect':24B,37B 'detail':57B 'elev':49B 'free':31B 'give':54B 'infrastructur':21B 'let':40B 'local':47B 'network':23B,36B 'network-connection-brok':22B 'privileg':51B 'sourc':53B 'trigger':60B 'use':29B 'use-after-fre':28B 'window':26B,35B,64B","search_c":"'allow':74C 'attack':77C 'author':76C 'broker':73C 'connect':72C 'elev':79C 'free':68C 'local':81C 'network':71C 'privileg':80C 'use':66C 'window':70C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:09+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-2026-108406","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108406","severity":null,"published_at":"2026-11-10T19:18:09+00:00","modified_at":"2026-11-10T19:18:09+00:00","first_seen_at":"2026-11-10T19:24:22+00:00","fetched_at":"2026-11-10T19:24:22+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"}