{"id":"CVE-2026-124227","kind":"vulnerability","aliases":["CVE-2026-124227"],"related":[],"title":"Microsoft Outlook: uninitialized memory lets a remote attacker run code","description":"Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.","summary":"Microsoft Office Outlook reads a resource before it is initialized. A remote, unauthenticated attacker could exploit this to execute code on the affected machine.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","outlook","package","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:20:49+00:00","first_seen_at":"2026-11-10T19:25:14+00:00","triaged_at":"2026-11-10T19:43:08+00:00","updated_at":"2026-11-10T19:43:08+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-10T19:43:08Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Outlook: uninitialized memory lets a remote attacker run code","impact":"high","summary":"Microsoft Office Outlook reads a resource before it is initialized. A remote, unauthenticated attacker could exploit this to execute code on the affected machine.","audience":"businesses","category":"package","nicknames":[],"who_cares":["outlook","microsoft-office","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the Outlook user's machine over the network","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-124227 for affected builds, patch, and whether user interaction (opening a message) is required.","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":"unknown"},"cost_usd":0.000629,"input_tokens":4496,"output_tokens":359,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-124227 for affected builds, patch, and whether user interaction (opening a message) is required.","search":"'-124227':13A,16A '-2026':12A,15A 'affect':45B 'allow':55C 'attack':8A,36B,58C 'code':10A,42B,61C 'could':37B 'cve':11A,14A 'execut':41B,60C 'exploit':38B 'initi':32B 'let':5A 'machin':46B 'memori':4A 'microsoft':1A,18B,23B,52C 'microsoft-offic':17B 'network':64C 'offic':19B,24B,53C 'outlook':2A,20B,25B,54C 'packag':21B 'read':26B 'remot':7A,34B 'resourc':28B,50C 'run':9A 'unauthent':35B 'unauthor':57C 'uniniti':3A,49C 'use':47C 'window':22B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","outlook","package","windows"],"campaign_type":null,"search_a":"'-124227':13A,16A '-2026':12A,15A 'attack':8A 'code':10A 'cve':11A,14A 'let':5A 'memori':4A 'microsoft':1A 'outlook':2A 'remot':7A 'run':9A 'uniniti':3A","search_b":"'affect':45B 'attack':36B 'code':42B 'could':37B 'execut':41B 'exploit':38B 'initi':32B 'machin':46B 'microsoft':18B,23B 'microsoft-offic':17B 'offic':19B,24B 'outlook':20B,25B 'packag':21B 'read':26B 'remot':34B 'resourc':28B 'unauthent':35B 'window':22B","search_c":"'allow':55C 'attack':58C 'code':61C 'execut':60C 'microsoft':52C 'network':64C 'offic':53C 'outlook':54C 'resourc':50C 'unauthor':57C 'uniniti':49C 'use':47C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:49+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124227","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124227","severity":null,"published_at":"2026-11-10T19:20:49+00:00","modified_at":"2026-11-10T19:20:50+00:00","first_seen_at":"2026-11-10T19:25:14+00:00","fetched_at":"2026-11-10T19:25:14+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"}