{"id":"CVE-2026-111307","kind":"vulnerability","aliases":["CVE-2026-111307"],"related":[],"title":"Microsoft Word: heap buffer overflow lets attacker run code remotely","description":"Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","summary":"A heap-based buffer overflow in Microsoft Office Word lets an unauthorized attacker run code over a network. The sources give a CVSS score of 8.8 but name no fixed version or patch.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","other","windows","word"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:28+00:00","first_seen_at":"2026-11-10T19:24:29+00:00","triaged_at":"2026-11-10T19:32:13+00:00","updated_at":"2026-11-10T19:32:13+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:32:13Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: heap buffer overflow lets attacker run code remotely","impact":"high","summary":"A heap-based buffer overflow in Microsoft Office Word lets an unauthorized attacker run code over a network. The sources give a CVSS score of 8.8 but name no fixed version or patch.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"attacker runs arbitrary code on the affected machine over the network","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-111307 for affected builds, patch availability and whether user interaction is required.","how_to_check":"- unknown","plain_action":"Update Microsoft Word through Microsoft's usual update channel once Microsoft releases a fix; the sources do not name a version yet.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Anyone running Microsoft Office Word is potentially exposed, as the flaw can be triggered over a network without credentials. The sources do not describe the exact trigger, configuration or file path, so unknown whether a default install is affected.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000688,"input_tokens":4494,"output_tokens":477,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-111307 for affected builds, patch availability and whether user interaction is required.","search":"'-111307':13A,16A '-2026':12A,15A '8.8':49B 'allow':66C 'attack':7A,36B,69C 'base':26B,59C 'buffer':4A,27B,60C 'code':9A,38B,72C 'cve':11A,14A 'cvss':46B 'execut':71C 'fix':53B 'give':44B 'heap':3A,25B,58C 'heap-bas':24B,57C 'let':6A,33B 'microsoft':1A,18B,30B,63C 'microsoft-offic':17B 'name':51B 'network':41B,75C 'offic':19B,31B,64C 'overflow':5A,28B,61C 'patch':56B 'remot':10A 'run':8A,37B 'score':47B 'sourc':43B 'unauthor':35B,68C 'version':54B 'window':21B 'word':2A,22B,32B,65C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Microsoft Office Word is potentially exposed, as the flaw can be triggered over a network without credentials. The sources do not describe the exact trigger, configuration or file path, so unknown whether a default install is affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":"Update Microsoft Word through Microsoft's usual update channel once Microsoft releases a fix; the sources do not name a version yet.","pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","other","windows","word"],"campaign_type":null,"search_a":"'-111307':13A,16A '-2026':12A,15A 'attack':7A 'buffer':4A 'code':9A 'cve':11A,14A 'heap':3A 'let':6A 'microsoft':1A 'overflow':5A 'remot':10A 'run':8A 'word':2A","search_b":"'8.8':49B 'attack':36B 'base':26B 'buffer':27B 'code':38B 'cvss':46B 'fix':53B 'give':44B 'heap':25B 'heap-bas':24B 'let':33B 'microsoft':18B,30B 'microsoft-offic':17B 'name':51B 'network':41B 'offic':19B,31B 'overflow':28B 'patch':56B 'run':37B 'score':47B 'sourc':43B 'unauthor':35B 'version':54B 'window':21B 'word':22B,32B","search_c":"'allow':66C 'attack':69C 'base':59C 'buffer':60C 'code':72C 'execut':71C 'heap':58C 'heap-bas':57C 'microsoft':63C 'network':75C 'offic':64C 'overflow':61C 'unauthor':68C 'word':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:28+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/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-2026-111307","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111307","severity":null,"published_at":"2026-11-10T19:18:28+00:00","modified_at":"2026-11-10T19:18:28+00:00","first_seen_at":"2026-11-10T19:24:29+00:00","fetched_at":"2026-11-10T19:24:29+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"}