{"id":"CVE-2026-116721","kind":"vulnerability","aliases":["CVE-2026-116721"],"related":[],"title":"Microsoft Word: uninitialized memory lets an attacker read data over network","description":"Use of uninitialized resource in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.","summary":"Microsoft Office Word reads a resource it never set up, so its contents can leak to an unauthorized attacker. The NVD entry rates it medium (CVSS 6.5) and says the attack works over a network.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office Word","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["microsoft-office","package","windows","word"],"not_affected_if":[],"how_to_check":"- Open Word and check File > Account for the installed Office build number.","fix":null,"status":"open","published_at":"2026-11-10T19:19:17+00:00","first_seen_at":"2026-11-10T19:24:45+00:00","triaged_at":"2026-11-10T19:57:51+00:00","updated_at":"2026-11-10T19:57:51+00:00","category":"package","confidence":0.4,"triage":{"at":"2026-11-10T19:57:51Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: uninitialized memory lets an attacker read data over network","impact":"low","summary":"Microsoft Office Word reads a resource it never set up, so its contents can leak to an unauthorized attacker. The NVD entry rates it medium (CVSS 6.5) and says the attack works over a network.","audience":"businesses","category":"package","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"unauthorized attacker reads information from affected Word systems","analyst_note":"Find the Microsoft Security Response Center advisory for CVE-2026-116721 to confirm affected builds, the fixed update and whether user interaction (opening a document) is required.","how_to_check":"- Open Word and check File > Account for the installed Office build number.\n- unknown","plain_action":"","product_name":"Microsoft Office Word","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000662,"input_tokens":4494,"output_tokens":426,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116721':14A,17A '-2026':13A,16A '6.5':53B 'allow':70C 'attack':7A,45B,57B,73C 'content':39B 'cve':12A,15A 'cvss':52B 'data':9A 'disclos':75C 'entri':48B 'inform':76C 'leak':41B 'let':5A 'medium':51B 'memori':4A 'microsoft':1A,18A,22B,27B,67C 'microsoft-offic':21B 'network':11A,61B,79C 'never':34B 'nvd':47B 'offic':23B,28B,68C 'office':19A 'packag':24B 'rate':49B 'read':8A,30B 'resourc':32B,65C 'say':55B 'set':35B 'unauthor':44B,72C 'uniniti':3A,64C 'use':62C 'window':25B 'word':2A,20A,26B,29B,69C 'work':58B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["microsoftofficeword","officeword"],"ptokens":["microsoft","office","word"],"labels":["medium","microsoftoffice","package","vendor","windows","word"],"campaign_type":null,"search_a":"'-116721':14A,17A '-2026':13A,16A 'attack':7A 'cve':12A,15A 'data':9A 'let':5A 'memori':4A 'microsoft':1A,18A 'network':11A 'office':19A 'read':8A 'uniniti':3A 'word':2A,20A","search_b":"'6.5':53B 'attack':45B,57B 'content':39B 'cvss':52B 'entri':48B 'leak':41B 'medium':51B 'microsoft':22B,27B 'microsoft-offic':21B 'network':61B 'never':34B 'nvd':47B 'offic':23B,28B 'packag':24B 'rate':49B 'read':30B 'resourc':32B 'say':55B 'set':35B 'unauthor':44B 'window':25B 'word':26B,29B 'work':58B","search_c":"'allow':70C 'attack':73C 'disclos':75C 'inform':76C 'microsoft':67C 'network':79C 'offic':68C 'resourc':65C 'unauthor':72C 'uniniti':64C 'use':62C 'word':69C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:17+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-116721","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116721","severity":null,"published_at":"2026-11-10T19:19:17+00:00","modified_at":"2026-11-10T19:19:17+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"}