{"id":"CVE-2026-119867","kind":"vulnerability","aliases":["CVE-2026-119867"],"related":[],"title":"Windows Installer: weak signature check lets an attacker bypass a security feature","description":"Improper verification of cryptographic signature in Windows Installer allows an unauthorized attacker to bypass a security feature over a network.","summary":"Windows Installer does not properly verify a cryptographic signature, so an unauthorized attacker can get past a security feature. The sources do not say what the bypassed feature protects or what the attacker gains beyond that.","severity":"medium","cvss":5.3,"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":"2026-11-10T19:20:05+00:00","first_seen_at":"2026-11-10T19:25:00+00:00","triaged_at":"2026-11-10T20:02:30+00:00","updated_at":"2026-11-10T20:02:30+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T20:02:30Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows Installer: weak signature check lets an attacker bypass a security feature","impact":"medium","summary":"Windows Installer does not properly verify a cryptographic signature, so an unauthorized attacker can get past a security feature. The sources do not say what the bypassed feature protects or what the attacker gains beyond that.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-installer"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"unknown; sources name only a security feature bypass","analyst_note":"Find Microsoft's advisory for CVE-2026-119867 to confirm affected Windows builds, the bypassed feature, and the patch.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000631,"input_tokens":4496,"output_tokens":363,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119867':15A,18A '-2026':14A,17A 'allow':67C 'attack':8A,36B,56B,70C 'beyond':58B 'bypass':9A,50B,72C 'check':5A 'cryptograph':31B,62C 'cve':13A,16A 'featur':12A,42B,51B,75C 'gain':57B 'get':38B 'improp':59C 'infrastructur':19B 'instal':2A,23B,25B,66C 'let':6A 'network':78C 'past':39B 'proper':28B 'protect':52B 'say':47B 'secur':11A,41B,74C 'signatur':4A,32B,63C 'sourc':44B 'unauthor':35B,69C 'verif':60C 'verifi':29B 'weak':3A 'window':1A,20B,22B,24B,65C 'windows-instal':21B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","medium","windows","windowsinstaller"],"campaign_type":null,"search_a":"'-119867':15A,18A '-2026':14A,17A 'attack':8A 'bypass':9A 'check':5A 'cve':13A,16A 'featur':12A 'instal':2A 'let':6A 'secur':11A 'signatur':4A 'weak':3A 'window':1A","search_b":"'attack':36B,56B 'beyond':58B 'bypass':50B 'cryptograph':31B 'featur':42B,51B 'gain':57B 'get':38B 'infrastructur':19B 'instal':23B,25B 'past':39B 'proper':28B 'protect':52B 'say':47B 'secur':41B 'signatur':32B 'sourc':44B 'unauthor':35B 'verifi':29B 'window':20B,22B,24B 'windows-instal':21B","search_c":"'allow':67C 'attack':70C 'bypass':72C 'cryptograph':62C 'featur':75C 'improp':59C 'instal':66C 'network':78C 'secur':74C 'signatur':63C 'unauthor':69C 'verif':60C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:05+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119867","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119867","severity":null,"published_at":"2026-11-10T19:20:05+00:00","modified_at":"2026-11-10T19:20:05+00:00","first_seen_at":"2026-11-10T19:25:00+00:00","fetched_at":"2026-11-10T19:25:00+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"}