{"id":"CVE-2026-116923","kind":"vulnerability","aliases":["CVE-2026-116923"],"related":[],"title":"Microsoft Word: heap buffer overflow lets a remote attacker run code","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 no further detail on the trigger or affected builds.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","other","windows"],"not_affected_if":["unknown"],"how_to_check":"- Check the installed Microsoft Word version in Word under File > Account (unknown versions from the sources)","fix":null,"status":"open","published_at":"2026-11-10T19:19:18+00:00","first_seen_at":"2026-11-10T19:24:45+00:00","triaged_at":"2026-11-10T19:30:28+00:00","updated_at":"2026-11-10T19:30:28+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:30:28Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: heap buffer overflow lets a remote attacker run code","impact":"high","summary":"A heap-based buffer overflow in Microsoft Office Word lets an unauthorized attacker run code over a network. The sources give no further detail on the trigger or affected builds.","audience":"businesses","category":"other","nicknames":[],"who_cares":["microsoft-office","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the affected machine over the network","analyst_note":"Confirm affected Word builds, fixed versions and whether user interaction (opening a document) is needed, from the Microsoft Security Update Guide entry for CVE-2026-116923.","how_to_check":"- Check the installed Microsoft Word version in Word under File > Account (unknown versions from the sources)\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Organizations running Microsoft Office Word are the ones exposed. The sources do not say which builds or configurations are affected, or whether opening a file is required. Teams running Office on managed endpoints should look for vendor guidance.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000684,"input_tokens":4494,"output_tokens":469,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Confirm affected Word builds, fixed versions and whether user interaction (opening a document) is needed, from the Microsoft Security Update Guide entry for CVE-2026-116923.","search":"'-116923':14A,17A '-2026':13A,16A 'affect':52B 'allow':63C 'attack':9A,36B,66C 'base':26B,56C 'buffer':4A,27B,57C 'build':53B 'code':11A,38B,69C 'cve':12A,15A 'detail':47B 'execut':68C 'give':44B 'heap':3A,25B,55C 'heap-bas':24B,54C 'let':6A,33B 'microsoft':1A,19B,30B,60C 'microsoft-offic':18B 'network':41B,72C 'offic':20B,31B,61C 'overflow':5A,28B,58C 'remot':8A 'run':10A,37B 'sourc':43B 'trigger':50B 'unauthor':35B,65C 'window':22B 'word':2A,32B,62C","nicknames":[],"mitigations":[],"who_affected":"Organizations running Microsoft Office Word are the ones exposed. The sources do not say which builds or configurations are affected, or whether opening a file is required. Teams running Office on managed endpoints should look for vendor guidance.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","other","windows"],"campaign_type":null,"search_a":"'-116923':14A,17A '-2026':13A,16A 'attack':9A 'buffer':4A 'code':11A 'cve':12A,15A 'heap':3A 'let':6A 'microsoft':1A 'overflow':5A 'remot':8A 'run':10A 'word':2A","search_b":"'affect':52B 'attack':36B 'base':26B 'buffer':27B 'build':53B 'code':38B 'detail':47B 'give':44B 'heap':25B 'heap-bas':24B 'let':33B 'microsoft':19B,30B 'microsoft-offic':18B 'network':41B 'offic':20B,31B 'overflow':28B 'run':37B 'sourc':43B 'trigger':50B 'unauthor':35B 'window':22B 'word':32B","search_c":"'allow':63C 'attack':66C 'base':56C 'buffer':57C 'code':69C 'execut':68C 'heap':55C 'heap-bas':54C 'microsoft':60C 'network':72C 'offic':61C 'overflow':58C 'unauthor':65C 'word':62C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:18+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-2026-116923","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116923","severity":null,"published_at":"2026-11-10T19:19:18+00:00","modified_at":"2026-11-10T19:19:19+00:00","first_seen_at":"2026-11-10T19:24:45+00:00","fetched_at":"2026-11-10T19:24:45+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"}