{"id":"CVE-2026-118293","kind":"vulnerability","aliases":["CVE-2026-118293"],"related":[],"title":"Microsoft Excel: out-of-bounds read lets a network attacker run code","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","summary":"A memory read past the end of a buffer in Microsoft Office Excel can be triggered by a crafted file or input over a network. An unauthorized attacker could use it to execute code on the affected machine.","severity":"high","cvss":8.8,"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":"2026-11-10T19:19:42+00:00","first_seen_at":"2026-11-10T19:24:51+00:00","triaged_at":"2026-11-10T19:29:57+00:00","updated_at":"2026-11-10T19:29:57+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T19:29:57Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: out-of-bounds read lets a network attacker run code","impact":"high","summary":"A memory read past the end of a buffer in Microsoft Office Excel can be triggered by a crafted file or input over a network. An unauthorized attacker could use it to execute code on the affected machine.","audience":"businesses","category":"other","nicknames":[],"who_cares":["microsoft-office","excel","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"code runs on the affected machine via crafted Excel input","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118293 for affected Office builds, patched versions and whether user opening of a file is required.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000631,"input_tokens":4492,"output_tokens":364,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118293 for affected Office builds, patched versions and whether user opening of a file is required.","search":"'-118293':16A,19A '-2026':15A,18A 'affect':62B 'allow':73C 'attack':11A,53B,76C 'bound':6A,67C 'buffer':34B 'code':13A,59B,79C 'could':54B 'craft':44B 'cve':14A,17A 'end':31B 'excel':2A,20B,38B,72C 'execut':58B,78C 'file':45B 'input':47B 'let':8A 'machin':63B 'memori':27B 'microsoft':1A,22B,36B,70C 'microsoft-offic':21B 'network':10A,50B,82C 'offic':23B,37B,71C 'out-of-bound':3A,64C 'past':29B 'read':7A,28B,68C 'run':12A 'trigger':41B 'unauthor':52B,75C 'use':55B 'window':25B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["excel","high","microsoftoffice","other","windows"],"campaign_type":null,"search_a":"'-118293':16A,19A '-2026':15A,18A 'attack':11A 'bound':6A 'code':13A 'cve':14A,17A 'excel':2A 'let':8A 'microsoft':1A 'network':10A 'out-of-bound':3A 'read':7A 'run':12A","search_b":"'affect':62B 'attack':53B 'buffer':34B 'code':59B 'could':54B 'craft':44B 'end':31B 'excel':20B,38B 'execut':58B 'file':45B 'input':47B 'machin':63B 'memori':27B 'microsoft':22B,36B 'microsoft-offic':21B 'network':50B 'offic':23B,37B 'past':29B 'read':28B 'trigger':41B 'unauthor':52B 'use':55B 'window':25B","search_c":"'allow':73C 'attack':76C 'bound':67C 'code':79C 'excel':72C 'execut':78C 'microsoft':70C 'network':82C 'offic':71C 'out-of-bound':64C 'read':68C 'unauthor':75C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:42+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-2026-118293","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118293","severity":null,"published_at":"2026-11-10T19:19:42+00:00","modified_at":"2026-11-10T19:19:42+00:00","first_seen_at":"2026-11-10T19:24:51+00:00","fetched_at":"2026-11-10T19:24:51+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"}