{"id":"CVE-2026-95920","kind":"vulnerability","aliases":["CVE-2026-95920"],"related":[],"title":"Windows Management Instrumentation: heap overflow lets a local user gain admin rights","description":"Heap-based buffer overflow in Windows Management Instrumentation allows an authorized attacker to elevate privileges locally.","summary":"A heap-based buffer overflow in Windows Management Instrumentation lets an already-authorized local user elevate their privileges. The sources do not describe an exploit in the wild.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["heap-overflow","infrastructure","local-privilege-escalation","windows","wmi"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":"Unknown until the MSRC entry is read. Meanwhile: check Windows Update history for the November 2026 (2026-11) cumulative update on each Windows host; run 'winver' or 'Get-HotFix' to list installed KBs.","fix":"Install the November 2026 Windows cumulative security update for your Windows version (per Microsoft's update guide for CVE-2026-95920); exact KB and build numbers unknown, not yet read from a primary source.","status":"open","published_at":"2026-11-10T19:21:45+00:00","first_seen_at":"2026-11-10T19:25:23+00:00","triaged_at":"2026-11-10T19:38:16+00:00","updated_at":"2026-11-10T20:25:12+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T19:38:16Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Management Instrumentation: heap overflow lets a local user gain admin rights","impact":"high","summary":"A heap-based buffer overflow in Windows Management Instrumentation lets an already-authorized local user elevate their privileges. The sources do not describe an exploit in the wild.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","wmi"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the machine","analyst_note":"Check Microsoft's security update guide for CVE-2026-95920 for affected Windows builds and the patch.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines where a user already has a logon account can be targeted by this local flaw in the Windows Management Instrumentation service. The sources do not name affected Windows builds or the exact conditions needed, so unknown.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000654,"input_tokens":4497,"output_tokens":409,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check Microsoft's security update guide for CVE-2026-95920 for affected Windows builds and the patch.","search":"'-2026':14A,17A '-95920':15A,18A 'admin':11A 'allow':68C 'alreadi':42B 'already-author':41B 'attack':71C 'author':43B,70C 'base':32B,61C 'buffer':33B,62C 'cve':13A,16A 'describ':53B 'elev':46B,73C 'escal':26B 'exploit':55B 'gain':10A 'heap':4A,20B,31B,60C 'heap-bas':30B,59C 'heap-overflow':19B 'infrastructur':22B 'instrument':3A,38B,67C 'let':6A,39B 'local':8A,24B,44B,75C 'local-privilege-escal':23B 'manag':2A,37B,66C 'overflow':5A,21B,34B,63C 'privileg':25B,48B,74C 'right':12A 'sourc':50B 'user':9A,45B 'wild':58B 'window':1A,27B,36B,65C 'wmi':28B","nicknames":[],"mitigations":[],"who_affected":"Windows machines where a user already has a logon account can be targeted by this local flaw in the Windows Management Instrumentation service. The sources do not name affected Windows builds or the exact conditions needed, so unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["heapoverflow","high","infrastructure","localprivilegeescalation","windows","wmi"],"campaign_type":null,"search_a":"'-2026':14A,17A '-95920':15A,18A 'admin':11A 'cve':13A,16A 'gain':10A 'heap':4A 'instrument':3A 'let':6A 'local':8A 'manag':2A 'overflow':5A 'right':12A 'user':9A 'window':1A","search_b":"'alreadi':42B 'already-author':41B 'author':43B 'base':32B 'buffer':33B 'describ':53B 'elev':46B 'escal':26B 'exploit':55B 'heap':20B,31B 'heap-bas':30B 'heap-overflow':19B 'infrastructur':22B 'instrument':38B 'let':39B 'local':24B,44B 'local-privilege-escal':23B 'manag':37B 'overflow':21B,34B 'privileg':25B,48B 'sourc':50B 'user':45B 'wild':58B 'window':27B,36B 'wmi':28B","search_c":"'allow':68C 'attack':71C 'author':70C 'base':61C 'buffer':62C 'elev':73C 'heap':60C 'heap-bas':59C 'instrument':67C 'local':75C 'manag':66C 'overflow':63C 'privileg':74C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:45+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-2026-95920","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95920","severity":null,"published_at":"2026-11-10T19:21:45+00:00","modified_at":"2026-11-10T19:21:45+00:00","first_seen_at":"2026-11-10T19:25:23+00:00","fetched_at":"2026-11-10T19:25:23+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-95920:2656","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95920","severity":null,"published_at":"2026-11-10T20:25:12+00:00","modified_at":"2026-11-10T20:25:12+00:00","first_seen_at":"2026-11-10T20:25:12+00:00","fetched_at":"2026-11-10T20:25:12+00:00","note":"Only NVD record read (CVSS 7.8, local, low privileges, no UI). MSRC update guide is JS-only and the Nov 2026 CVRF is too large to fetch; affected builds, KBs and fixed builds not read, so nothing verified. Exploitation not stated in sources. Revisit with the MSRC page or the Nov 2026 Patch Tuesday KB list. X and web search not tried.","cites":["https://nvd.nist.gov/vuln/detail/CVE-2026-95920"]}],"documents":[{"id":118017,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95920","title":"NVD CVE-2026-95920","kind":"advisory","source":"analyst","publisher":null,"text":"Heap-based buffer overflow in Windows Management Instrumentation allows an authorized attacker to elevate privileges locally. CVSS 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (secure@microsoft.com).","published_at":null,"relation":"describes","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"}