{"id":"CVE-2026-88235","kind":"vulnerability","aliases":["CVE-2026-88235"],"related":[],"title":"Windows Servicing Stack Updates: confused deputy lets a local user gain privileges","description":"Unintended proxy or intermediary ('confused deputy') in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.","summary":"Microsoft's Servicing Stack Updates component can be made to act as an unintended intermediary, a confused deputy. An authorized local attacker can use it to elevate their privileges on the machine.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","servicing-stack-update","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:32+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","triaged_at":"2026-11-10T19:38:38+00:00","updated_at":"2026-11-10T19:38:38+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:38:38Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Servicing Stack Updates: confused deputy lets a local user gain privileges","impact":"high","summary":"Microsoft's Servicing Stack Updates component can be made to act as an unintended intermediary, a confused deputy. An authorized local attacker can use it to elevate their privileges on the machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","servicing-stack-update"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains elevated system privileges on the machine","analyst_note":"Check the NVD entry and Microsoft's security update guide for affected Windows builds, the patched KB, and any mitigation for CVE-2026-88235.","how_to_check":"unknown","plain_action":"","product_name":"Windows Servicing Stack","needs_analyst":true,"not_affected_if":[],"who_is_affected":"The sources only describe a local privilege escalation in Servicing Stack Updates and do not list affected builds or configurations. Systems where untrusted or low-privilege users have local logons are the ones to look at first. Machines with no local user access beyond administrators have less exposure.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.00069,"input_tokens":4507,"output_tokens":478,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the NVD entry and Microsoft's security update guide for affected Windows builds, the patched KB, and any mitigation for CVE-2026-88235.","search":"'-2026':14A,17A '-88235':15A,18A 'act':35B 'allow':67C 'attack':46B,70C 'author':44B,69C 'compon':30B 'confus':5A,41B,61C 'cve':13A,16A 'deputi':6A,42B,62C 'elev':51B,72C 'gain':11A 'infrastructur':19B 'intermediari':39B,60C 'let':7A 'local':9A,45B,74C 'machin':56B 'made':33B 'microsoft':25B 'privileg':12A,53B,73C 'proxi':58C 'servic':2A,21B,27B,64C 'servicing-stack-upd':20B 'stack':3A,22B,28B,65C 'unintend':38B,57C 'updat':4A,23B,29B,66C 'use':48B 'user':10A 'window':1A,24B","nicknames":[],"mitigations":[],"who_affected":"The sources only describe a local privilege escalation in Servicing Stack Updates and do not list affected builds or configurations. Systems where untrusted or low-privilege users have local logons are the ones to look at first. Machines with no local user access beyond administrators have less exposure.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","servicingstackupdate","windows"],"campaign_type":null,"search_a":"'-2026':14A,17A '-88235':15A,18A 'confus':5A 'cve':13A,16A 'deputi':6A 'gain':11A 'let':7A 'local':9A 'privileg':12A 'servic':2A 'stack':3A 'updat':4A 'user':10A 'window':1A","search_b":"'act':35B 'attack':46B 'author':44B 'compon':30B 'confus':41B 'deputi':42B 'elev':51B 'infrastructur':19B 'intermediari':39B 'local':45B 'machin':56B 'made':33B 'microsoft':25B 'privileg':53B 'servic':21B,27B 'servicing-stack-upd':20B 'stack':22B,28B 'unintend':38B 'updat':23B,29B 'use':48B 'window':24B","search_c":"'allow':67C 'attack':70C 'author':69C 'confus':61C 'deputi':62C 'elev':72C 'intermediari':60C 'local':74C 'privileg':73C 'proxi':58C 'servic':64C 'stack':65C 'unintend':57C 'updat':66C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:32+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-2026-88235","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88235","severity":null,"published_at":"2026-11-10T19:21:32+00:00","modified_at":"2026-11-10T19:21:32+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","fetched_at":"2026-11-10T19:25:20+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"}