{"id":"CVE-2026-96074","kind":"vulnerability","aliases":["CVE-2026-96074"],"related":[],"title":"Windows AppX Package Manager: heap overflow lets a local user gain higher privileges","description":"Heap-based buffer overflow in Windows AppX Package Manager allows an authorized attacker to elevate privileges locally.","summary":"A heap-based buffer overflow in the Windows AppX Package Manager lets a user who already has local access elevate their privileges. The sources do not describe the exact trigger or the affected Windows builds.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["appx","endpoints","infrastructure","local-privilege-escalation","windows"],"not_affected_if":["no-local-untrusted-users"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:22:05+00:00","first_seen_at":"2026-11-10T19:25:29+00:00","triaged_at":"2026-11-10T19:36:35+00:00","updated_at":"2026-11-10T19:54:46+00:00","category":"infrastructure","confidence":0.3,"triage":{"at":"2026-11-10T19:36:35Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows AppX Package Manager: heap overflow lets a local user gain higher privileges","impact":"high","summary":"A heap-based buffer overflow in the Windows AppX Package Manager lets a user who already has local access elevate their privileges. The sources do not describe the exact trigger or the affected Windows builds.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","appx","endpoints"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains elevated system privileges on the machine","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-96074 for affected Windows builds, the patch, and any detection or mitigation guidance.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Windows machines where the AppX Package Manager component is present; the sources do not list the affected Windows versions or builds. An attacker must already be an authorized local user, so shared or multi-user Windows systems carry the most exposure.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000674,"input_tokens":4498,"output_tokens":449,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-96074 for affected Windows builds, the patch, and any detection or mitigation guidance.","search":"'-2026':15A,18A '-96074':16A,19A 'access':47B 'affect':61B 'allow':74C 'alreadi':44B 'appx':2A,20B,37B,71C 'attack':77C 'author':76C 'base':31B,66C 'buffer':32B,67C 'build':63B 'cve':14A,17A 'describ':55B 'elev':48B,79C 'endpoint':21B 'escal':26B 'exact':57B 'gain':11A 'heap':5A,30B,65C 'heap-bas':29B,64C 'higher':12A 'infrastructur':22B 'let':7A,40B 'local':9A,24B,46B,81C 'local-privilege-escal':23B 'manag':4A,39B,73C 'overflow':6A,33B,68C 'packag':3A,38B,72C 'privileg':13A,25B,50B,80C 'sourc':52B 'trigger':58B 'user':10A,42B 'window':1A,27B,36B,62B,70C","nicknames":[],"mitigations":[],"who_affected":"Windows machines where the AppX Package Manager component is present; the sources do not list the affected Windows versions or builds. An attacker must already be an authorized local user, so shared or multi-user Windows systems carry the most exposure.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["appx","endpoints","high","infrastructure","localprivilegeescalation","windows"],"campaign_type":null,"search_a":"'-2026':15A,18A '-96074':16A,19A 'appx':2A 'cve':14A,17A 'gain':11A 'heap':5A 'higher':12A 'let':7A 'local':9A 'manag':4A 'overflow':6A 'packag':3A 'privileg':13A 'user':10A 'window':1A","search_b":"'access':47B 'affect':61B 'alreadi':44B 'appx':20B,37B 'base':31B 'buffer':32B 'build':63B 'describ':55B 'elev':48B 'endpoint':21B 'escal':26B 'exact':57B 'heap':30B 'heap-bas':29B 'infrastructur':22B 'let':40B 'local':24B,46B 'local-privilege-escal':23B 'manag':39B 'overflow':33B 'packag':38B 'privileg':25B,50B 'sourc':52B 'trigger':58B 'user':42B 'window':27B,36B,62B","search_c":"'allow':74C 'appx':71C 'attack':77C 'author':76C 'base':66C 'buffer':67C 'elev':79C 'heap':65C 'heap-bas':64C 'local':81C 'manag':73C 'overflow':68C 'packag':72C 'privileg':80C 'window':70C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:22:05+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-2026-96074","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96074","severity":null,"published_at":"2026-11-10T19:22:05+00:00","modified_at":"2026-11-10T19:22:05+00:00","first_seen_at":"2026-11-10T19:25:29+00:00","fetched_at":"2026-11-10T19:25:29+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-96074:2578","url":null,"severity":null,"published_at":"2026-11-10T19:54:46+00:00","modified_at":"2026-11-10T19:54:46+00:00","first_seen_at":"2026-11-10T19:54:46+00:00","fetched_at":"2026-11-10T19:54:46+00:00","note":"No primary source readable: MSRC page and CVRF returned empty, NVD page has no content. Affected builds, KB and fix unknown; the sibling CVE-2026-85934 (AppX use-after-free) is a different CVE and was not used. To settle: open the MSRC update guide entry for the CVE in a browser."}],"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"}