{"id":"CVE-2026-105543","kind":"vulnerability","aliases":["CVE-2026-105543"],"related":[],"title":"Windows Installer: null pointer flaw lets local users gain higher privileges","description":"Null pointer dereference in Windows Installer allows an authorized attacker to elevate privileges locally.","summary":"A null pointer dereference in Windows Installer lets an attacker who already has a local account raise their privileges. The sources give no further detail on the trigger or the affected Windows versions.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows","windows-installer"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:17:56+00:00","first_seen_at":"2026-11-10T19:24:19+00:00","triaged_at":"2026-11-10T19:42:32+00:00","updated_at":"2026-11-10T19:42:32+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:42:32Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Installer: null pointer flaw lets local users gain higher privileges","impact":"high","summary":"A null pointer dereference in Windows Installer lets an attacker who already has a local account raise their privileges. The sources give no further detail on the trigger or the affected Windows versions.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-installer"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"Local user gains elevated system privileges on the Windows machine","analyst_note":"Check the Microsoft security update guide entry for CVE-2026-105543 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 with Windows Installer, where a user already has a local account on the system. The sources do not list affected Windows versions or configurations.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000641,"input_tokens":4482,"output_tokens":385,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft security update guide entry for CVE-2026-105543 for affected Windows builds and the patch.","search":"'-105543':14A,17A '-2026':13A,16A 'account':38B 'affect':53B 'allow':62C 'alreadi':34B 'attack':32B,65C 'author':64C 'cve':12A,15A 'derefer':26B,58C 'detail':47B 'elev':67C 'flaw':5A 'gain':9A 'give':44B 'higher':10A 'infrastructur':18B 'instal':2A,22B,29B,61C 'let':6A,30B 'local':7A,37B,69C 'null':3A,24B,56C 'pointer':4A,25B,57C 'privileg':11A,41B,68C 'rais':39B 'sourc':43B 'trigger':50B 'user':8A 'version':55B 'window':1A,19B,21B,28B,54B,60C 'windows-instal':20B","nicknames":[],"mitigations":[],"who_affected":"Windows machines with Windows Installer, where a user already has a local account on the system. The sources do not list affected Windows versions or configurations.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","windows","windowsinstaller"],"campaign_type":null,"search_a":"'-105543':14A,17A '-2026':13A,16A 'cve':12A,15A 'flaw':5A 'gain':9A 'higher':10A 'instal':2A 'let':6A 'local':7A 'null':3A 'pointer':4A 'privileg':11A 'user':8A 'window':1A","search_b":"'account':38B 'affect':53B 'alreadi':34B 'attack':32B 'derefer':26B 'detail':47B 'give':44B 'infrastructur':18B 'instal':22B,29B 'let':30B 'local':37B 'null':24B 'pointer':25B 'privileg':41B 'rais':39B 'sourc':43B 'trigger':50B 'version':55B 'window':19B,21B,28B,54B 'windows-instal':20B","search_c":"'allow':62C 'attack':65C 'author':64C 'derefer':58C 'elev':67C 'instal':61C 'local':69C 'null':56C 'pointer':57C 'privileg':68C 'window':60C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:17:56+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-2026-105543","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105543","severity":null,"published_at":"2026-11-10T19:17:56+00:00","modified_at":"2026-11-10T19:17:56+00:00","first_seen_at":"2026-11-10T19:24:19+00:00","fetched_at":"2026-11-10T19:24:19+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"}