{"id":"CVE-2026-118728","kind":"vulnerability","aliases":["CVE-2026-118728"],"related":[],"title":"Microsoft Excel: out-of-bounds read can leak data over network","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.","summary":"A flaw in Microsoft Office Excel lets an out-of-bounds memory read happen when a crafted file or input is processed. An unauthorized attacker over a network could disclose information from the affected system.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["excel","microsoft-office","other","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:49+00:00","first_seen_at":"2026-11-10T19:24:54+00:00","triaged_at":"2026-11-10T19:57:42+00:00","updated_at":"2026-11-10T19:57:42+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T19:57:42Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: out-of-bounds read can leak data over network","impact":"low","summary":"A flaw in Microsoft Office Excel lets an out-of-bounds memory read happen when a crafted file or input is processed. An unauthorized attacker over a network could disclose information from the affected system.","audience":"businesses","category":"other","nicknames":[],"who_cares":["microsoft-office","excel","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker reads memory contents, possibly exposing sensitive information.","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-118728 for affected versions, fixed builds and whether user interaction is required.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organizations running Microsoft Office Excel. The sources do not state which versions or configurations are affected, nor how the attacker reaches the component.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000654,"input_tokens":4495,"output_tokens":408,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-118728':15A,18A '-2026':14A,17A 'affect':59B 'allow':70C 'attack':50B,73C 'bound':6A,36B,64C 'could':54B 'craft':42B 'cve':13A,16A 'data':10A 'disclos':55B,75C 'excel':2A,19B,30B,69C 'file':43B 'flaw':26B 'happen':39B 'inform':56B,76C 'input':45B 'leak':9A 'let':31B 'memori':37B 'microsoft':1A,21B,28B,67C 'microsoft-offic':20B 'network':12A,53B,79C 'offic':22B,29B,68C 'out-of-bound':3A,33B,61C 'process':47B 'read':7A,38B,65C 'system':60B 'unauthor':49B,72C 'window':24B","nicknames":[],"mitigations":[],"who_affected":"Organizations running Microsoft Office Excel. The sources do not state which versions or configurations are affected, nor how the attacker reaches the component.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["excel","medium","microsoftoffice","other","windows"],"campaign_type":null,"search_a":"'-118728':15A,18A '-2026':14A,17A 'bound':6A 'cve':13A,16A 'data':10A 'excel':2A 'leak':9A 'microsoft':1A 'network':12A 'out-of-bound':3A 'read':7A","search_b":"'affect':59B 'attack':50B 'bound':36B 'could':54B 'craft':42B 'disclos':55B 'excel':19B,30B 'file':43B 'flaw':26B 'happen':39B 'inform':56B 'input':45B 'let':31B 'memori':37B 'microsoft':21B,28B 'microsoft-offic':20B 'network':53B 'offic':22B,29B 'out-of-bound':33B 'process':47B 'read':38B 'system':60B 'unauthor':49B 'window':24B","search_c":"'allow':70C 'attack':73C 'bound':64C 'disclos':75C 'excel':69C 'inform':76C 'microsoft':67C 'network':79C 'offic':68C 'out-of-bound':61C 'read':65C 'unauthor':72C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:49+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-2026-118728","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118728","severity":null,"published_at":"2026-11-10T19:19:49+00:00","modified_at":"2026-11-10T19:19:49+00:00","first_seen_at":"2026-11-10T19:24:54+00:00","fetched_at":"2026-11-10T19:24:54+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"}