{"id":"CVE-2026-112723","kind":"vulnerability","aliases":["CVE-2026-112723"],"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 execute code over a network. NVD rates it high (CVSS 8.8), and the sources give no further detail on the trigger.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office Word","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["microsoft-office","other","windows","word"],"not_affected_if":[],"how_to_check":"- Check the installed Word version in File > Account > About Word, or confirm it against Microsoft's security update guide for CVE-2026-112723 (unknown if the sources list affected builds)\n- Check whether Office updates are applied through Microsoft Update or your management tool","fix":null,"status":"open","published_at":"2026-11-10T19:18:30+00:00","first_seen_at":"2026-11-10T19:24:30+00:00","triaged_at":"2026-11-10T19:32:02+00:00","updated_at":"2026-11-10T19:32:02+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T19:32:02Z","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 execute code over a network. NVD rates it high (CVSS 8.8), and the sources give no further detail on the trigger.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs arbitrary code on the machine running Word.","analyst_note":"Find Microsoft's security update guide entry for CVE-2026-112723 for affected builds, the fixed update, and whether a user action such as opening a file is required.","how_to_check":"- Check the installed Word version in File > Account > About Word, or confirm it against Microsoft's security update guide for CVE-2026-112723 (unknown if the sources list affected builds)\n- Check whether Office updates are applied through Microsoft Update or your management tool","plain_action":"Install the latest Microsoft Office security update for Word as soon as Microsoft releases the fix for CVE-2026-112723.","product_name":"Microsoft Office Word","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown. The sources say only that the flaw is a heap-based buffer overflow in Microsoft Office Word that an unauthorized attacker can exploit over a network to run code. They do not name affected builds, the file or trigger needed, or whether opening a document is enough.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000755,"input_tokens":4494,"output_tokens":611,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find Microsoft's security update guide entry for CVE-2026-112723 for affected builds, the fixed update, and whether a user action such as opening a file is required.","search":"'-112723':14A,17A '-2026':13A,16A '8.8':51B 'allow':71C 'attack':9A,40B,74C 'base':30B,64C 'buffer':4A,31B,65C 'code':11A,42B,77C 'cve':12A,15A 'cvss':50B 'detail':58B 'execut':41B,76C 'give':55B 'heap':3A,29B,63C 'heap-bas':28B,62C 'high':49B 'let':6A,37B 'microsoft':1A,18A,22B,34B,68C 'microsoft-offic':21B 'network':45B,80C 'nvd':46B 'offic':23B,35B,69C 'office':19A 'overflow':5A,32B,66C 'rate':47B 'remot':8A 'run':10A 'sourc':54B 'trigger':61B 'unauthor':39B,73C 'window':25B 'word':2A,20A,26B,36B,70C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":null,"pkeys":["microsoftofficeword","officeword"],"ptokens":["microsoft","office","word"],"labels":["high","microsoftoffice","other","vendor","windows","word"],"campaign_type":null,"search_a":"'-112723':14A,17A '-2026':13A,16A 'attack':9A 'buffer':4A 'code':11A 'cve':12A,15A 'heap':3A 'let':6A 'microsoft':1A,18A 'office':19A 'overflow':5A 'remot':8A 'run':10A 'word':2A,20A","search_b":"'8.8':51B 'attack':40B 'base':30B 'buffer':31B 'code':42B 'cvss':50B 'detail':58B 'execut':41B 'give':55B 'heap':29B 'heap-bas':28B 'high':49B 'let':37B 'microsoft':22B,34B 'microsoft-offic':21B 'network':45B 'nvd':46B 'offic':23B,35B 'overflow':32B 'rate':47B 'sourc':54B 'trigger':61B 'unauthor':39B 'window':25B 'word':26B,36B","search_c":"'allow':71C 'attack':74C 'base':64C 'buffer':65C 'code':77C 'execut':76C 'heap':63C 'heap-bas':62C 'microsoft':68C 'network':80C 'offic':69C 'overflow':66C 'unauthor':73C 'word':70C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:30+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-2026-112723","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112723","severity":null,"published_at":"2026-11-10T19:18:30+00:00","modified_at":"2026-11-10T19:18:31+00:00","first_seen_at":"2026-11-10T19:24:30+00:00","fetched_at":"2026-11-10T19:24:30+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"}