{"id":"CVE-2026-118727","kind":"vulnerability","aliases":["CVE-2026-118727"],"related":[],"title":"Microsoft Excel: out-of-bounds read lets an attacker leak information over a network","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.","summary":"Microsoft Office Excel reads memory past the end of a buffer, so an unauthorized attacker over a network can disclose information. The sources do not say which data is exposed or what user action is needed.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office Excel","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["excel","microsoft-office","other"],"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":"2026-11-10T19:57:41+00:00","updated_at":"2026-11-10T19:57:41+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:57:41Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: out-of-bounds read lets an attacker leak information over a network","impact":"low","summary":"Microsoft Office Excel reads memory past the end of a buffer, so an unauthorized attacker over a network can disclose information. The sources do not say which data is exposed or what user action is needed.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-office","excel"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker reads some memory contents from affected Excel","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-118727 for affected builds, patch and whether a user must open a file.","how_to_check":"unknown","plain_action":"","product_name":"Microsoft Office Excel","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":0.000642,"input_tokens":4495,"output_tokens":384,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-118727':18A,21A '-2026':17A,20A 'action':62B 'allow':74C 'attack':10A,43B,77C 'bound':6A,68C 'buffer':39B 'cve':16A,19A 'data':56B 'disclos':48B,79C 'end':36B 'excel':2A,24A,25B,31B,73C 'expos':58B 'inform':12A,49B,80C 'leak':11A 'let':8A 'memori':33B 'microsoft':1A,22A,27B,29B,71C 'microsoft-offic':26B 'need':64B 'network':15A,46B,83C 'offic':28B,30B,72C 'office':23A 'out-of-bound':3A,65C 'past':34B 'read':7A,32B,69C 'say':54B 'sourc':51B 'unauthor':42B,76C 'user':61B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":null,"pkeys":["microsoftofficeexcel","officeexcel"],"ptokens":["excel","microsoft","office"],"labels":["excel","medium","microsoftoffice","other","vendor"],"campaign_type":null,"search_a":"'-118727':18A,21A '-2026':17A,20A 'attack':10A 'bound':6A 'cve':16A,19A 'excel':2A,24A 'inform':12A 'leak':11A 'let':8A 'microsoft':1A,22A 'network':15A 'office':23A 'out-of-bound':3A 'read':7A","search_b":"'action':62B 'attack':43B 'buffer':39B 'data':56B 'disclos':48B 'end':36B 'excel':25B,31B 'expos':58B 'inform':49B 'memori':33B 'microsoft':27B,29B 'microsoft-offic':26B 'need':64B 'network':46B 'offic':28B,30B 'past':34B 'read':32B 'say':54B 'sourc':51B 'unauthor':42B 'user':61B","search_c":"'allow':74C 'attack':77C 'bound':68C 'disclos':79C 'excel':73C 'inform':80C 'microsoft':71C 'network':83C 'offic':72C 'out-of-bound':65C 'read':69C 'unauthor':76C","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-2026-118727","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118727","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"}