{"id":"CVE-2026-118220","kind":"vulnerability","aliases":["CVE-2026-118220"],"related":[],"title":"Windows: double free in Multiple Provider Router allows local privilege escalation","description":"Double free in Windows Multiple Provider Router allows an authorized attacker to elevate privileges locally.","summary":"A memory bug (double free) in the Windows Multiple Provider Router lets a user who already has an account on the machine gain higher privileges. Severity is high (CVSS 7.8) according to NVD.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows Multiple Provider Router","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["double-free","infrastructure","local-privilege-escalation","windows"],"not_affected_if":[],"how_to_check":"Unknown: affected Windows builds are not yet read from Microsoft. Check the MSRC Security Update Guide entry for CVE-2026-118220 and compare with the installed KB/build (winver or Get-HotFix).","fix":"Unknown: apply the November 2026 Windows cumulative update (MSRC released 2026-11-10 Patch Tuesday set) once the KB for your build is confirmed on the MSRC page.","status":"open","published_at":"2026-11-10T19:19:39+00:00","first_seen_at":"2026-11-10T19:24:50+00:00","triaged_at":"2026-11-10T19:40:41+00:00","updated_at":"2026-11-10T23:20:07+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T19:40:41Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows: double free in Multiple Provider Router allows local privilege escalation","impact":"high","summary":"A memory bug (double free) in the Windows Multiple Provider Router lets a user who already has an account on the machine gain higher privileges. Severity is high (CVSS 7.8) according to NVD.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local attacker gains elevated system privileges on the Windows machine","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118220 for affected Windows builds and the patch.","how_to_check":"unknown","plain_action":"","product_name":"Windows Multiple Provider Router","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines where a user already has a local account can be elevated to higher privileges through this flaw. The sources do not say which Windows versions or configurations are affected, so unknown.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000665,"input_tokens":4484,"output_tokens":433,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118220 for affected Windows builds and the patch.","search":"'-118220':14A,17A '-2026':13A,16A '7.8':60B 'accord':61B 'account':49B 'allow':8A,71C 'alreadi':46B 'attack':74C 'author':73C 'bug':33B 'cve':12A,15A 'cvss':59B 'doubl':2A,23B,34B,64C 'double-fre':22B 'elev':76C 'escal':11A,29B 'free':3A,24B,35B,65C 'gain':53B 'high':58B 'higher':54B 'infrastructur':25B 'let':42B 'local':9A,27B,78C 'local-privilege-escal':26B 'machin':52B 'memori':32B 'multipl':5A,39B,68C 'multiple':19A 'nvd':63B 'privileg':10A,28B,55B,77C 'provid':6A,40B,69C 'provider':20A 'router':7A,21A,41B,70C 'sever':56B 'user':44B 'window':1A,30B,38B,67C 'windows':18A","nicknames":[],"mitigations":[],"who_affected":"Windows machines where a user already has a local account can be elevated to higher privileges through this flaw. The sources do not say which Windows versions or configurations are affected, so unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["multipleproviderrouter","windowsmultipleproviderrouter"],"ptokens":["multiple","provider","router","windows"],"labels":["doublefree","high","infrastructure","localprivilegeescalation","vendor","windows"],"campaign_type":null,"search_a":"'-118220':14A,17A '-2026':13A,16A 'allow':8A 'cve':12A,15A 'doubl':2A 'escal':11A 'free':3A 'local':9A 'multipl':5A 'multiple':19A 'privileg':10A 'provid':6A 'provider':20A 'router':7A,21A 'window':1A 'windows':18A","search_b":"'7.8':60B 'accord':61B 'account':49B 'alreadi':46B 'bug':33B 'cvss':59B 'doubl':23B,34B 'double-fre':22B 'escal':29B 'free':24B,35B 'gain':53B 'high':58B 'higher':54B 'infrastructur':25B 'let':42B 'local':27B 'local-privilege-escal':26B 'machin':52B 'memori':32B 'multipl':39B 'nvd':63B 'privileg':28B,55B 'provid':40B 'router':41B 'sever':56B 'user':44B 'window':30B,38B","search_c":"'allow':71C 'attack':74C 'author':73C 'doubl':64C 'elev':76C 'free':65C 'local':78C 'multipl':68C 'privileg':77C 'provid':69C 'router':70C 'window':67C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:39+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/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-2026-118220","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118220","severity":null,"published_at":"2026-11-10T19:19:39+00:00","modified_at":"2026-11-10T19:19:39+00:00","first_seen_at":"2026-11-10T19:24:50+00:00","fetched_at":"2026-11-10T19:24:50+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-118220:3145","url":"https://www.rapid7.com/db/vulnerabilities/cve-2026-118220/","severity":null,"published_at":"2026-11-10T23:20:07+00:00","modified_at":"2026-11-10T23:20:07+00:00","first_seen_at":"2026-11-10T23:20:07+00:00","fetched_at":"2026-11-10T23:20:07+00:00","note":"MSRC page is JS-only and the browser tool is out of quota, so no primary source read. Rapid7 confirms: local, low-privilege, double free, CVSS 7.8, not in KEV, published 2026-11-10. Nothing verified; affected builds and KB numbers still unknown. A revisit needs the MSRC page text or CVRF entry.","cites":["https://www.rapid7.com/db/vulnerabilities/cve-2026-118220/"]}],"documents":[{"id":120106,"url":"https://www.rapid7.com/db/vulnerabilities/cve-2026-118220/","title":"Rapid7: CVE-2026-118220","kind":"other","source":"analyst","publisher":null,"text":"Double free in Windows Multiple Provider Router allows an authorized attacker to elevate privileges locally. CVSS 3.1 7.8 (AV:L/AC:L/PR:L/UI:N). Published Nov 10, 2026. Not in CISA KEV. EPSS N/A.","published_at":null,"relation":"mentions","confidence":null,"note":null}],"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"}