{"id":"CVE-2026-119869","kind":"vulnerability","aliases":["CVE-2026-119869"],"related":[],"title":"Windows Failover Cluster: use-after-free lets a local user gain higher privileges","description":"Use after free in Windows Failover Cluster allows an authorized attacker to elevate privileges locally.","summary":"A memory-handling bug in Windows Failover Cluster lets an attacker who already has a local account elevate their privileges. The attacker needs to be authorized on the machine first.","severity":"medium","cvss":6.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["failover-clustering","infrastructure","on-prem-servers","windows"],"not_affected_if":["no-failover-clustering","no-local-accounts"],"how_to_check":"- Check the Windows build with `winver` or `Get-ComputerInfo` and compare it to Microsoft's fixed build for CVE-2026-119869.\n- Check whether the Failover Clustering role is installed with `Get-WindowsFeature Failover-Clustering`.","fix":null,"status":"open","published_at":"2026-11-10T19:20:05+00:00","first_seen_at":"2026-11-10T19:25:00+00:00","triaged_at":"2026-11-10T19:58:22+00:00","updated_at":"2026-11-10T19:58:22+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:58:22Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Failover Cluster: use-after-free lets a local user gain higher privileges","impact":"high","summary":"A memory-handling bug in Windows Failover Cluster lets an attacker who already has a local account elevate their privileges. The attacker needs to be authorized on the machine first.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","failover-clustering","on-prem-servers"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains elevated system privileges on the server","analyst_note":"Find the affected Windows builds and the Microsoft security update for CVE-2026-119869 at the MSRC advisory page, since the NVD entry lists no ranges.","how_to_check":"- Check the Windows build with `winver` or `Get-ComputerInfo` and compare it to Microsoft's fixed build for CVE-2026-119869.\n- Check whether the Failover Clustering role is installed with `Get-WindowsFeature Failover-Clustering`.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-failover-clustering","no-local-accounts"],"who_is_affected":"Only Windows servers running the Failover Clustering feature are in scope, and an attacker needs a local, authorized account on the machine. Standalone Windows machines without clustering are unlikely to be affected. The sources do not give the affected build ranges.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000722,"input_tokens":4483,"output_tokens":548,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119869':17A,20A '-2026':16A,19A 'account':47B 'allow':68C 'alreadi':43B 'attack':41B,52B,71C 'author':56B,70C 'bug':34B 'cluster':3A,23B,38B,67C 'cve':15A,18A 'elev':48B,73C 'failov':2A,22B,37B,66C 'failover-clust':21B 'first':60B 'free':7A,63C 'gain':12A 'handl':33B 'higher':13A 'infrastructur':24B 'let':8A,39B 'local':10A,46B,75C 'machin':59B 'memori':32B 'memory-handl':31B 'need':53B 'on-prem-serv':25B 'prem':27B 'privileg':14A,50B,74C 'server':28B 'use':5A,61C 'use-after-fre':4A 'user':11A 'window':1A,29B,36B,65C","nicknames":[],"mitigations":[],"who_affected":"Only Windows servers running the Failover Clustering feature are in scope, and an attacker needs a local, authorized account on the machine. Standalone Windows machines without clustering are unlikely to be affected. The sources do not give the affected build ranges.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["failoverclustering","infrastructure","medium","onpremservers","windows"],"campaign_type":null,"search_a":"'-119869':17A,20A '-2026':16A,19A 'cluster':3A 'cve':15A,18A 'failov':2A 'free':7A 'gain':12A 'higher':13A 'let':8A 'local':10A 'privileg':14A 'use':5A 'use-after-fre':4A 'user':11A 'window':1A","search_b":"'account':47B 'alreadi':43B 'attack':41B,52B 'author':56B 'bug':34B 'cluster':23B,38B 'elev':48B 'failov':22B,37B 'failover-clust':21B 'first':60B 'handl':33B 'infrastructur':24B 'let':39B 'local':46B 'machin':59B 'memori':32B 'memory-handl':31B 'need':53B 'on-prem-serv':25B 'prem':27B 'privileg':50B 'server':28B 'window':29B,36B","search_c":"'allow':68C 'attack':71C 'author':70C 'cluster':67C 'elev':73C 'failov':66C 'free':63C 'local':75C 'privileg':74C 'use':61C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:05+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119869","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119869","severity":null,"published_at":"2026-11-10T19:20:05+00:00","modified_at":"2026-11-10T19:20:06+00:00","first_seen_at":"2026-11-10T19:25:00+00:00","fetched_at":"2026-11-10T19:25:00+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"}