{"id":"CVE-2026-118732","kind":"vulnerability","aliases":["CVE-2026-118732"],"related":[],"title":"Microsoft Excel: use-after-free lets a remote attacker run code","description":"Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","summary":"A memory bug in Microsoft Office Excel lets a use-after-free condition be triggered over a network. An unauthorized attacker could use it to execute code on the victim's machine.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["excel","microsoft-office","package","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":"2026-11-10T19:28:12+00:00","updated_at":"2026-11-10T19:28:12+00:00","category":"package","confidence":0.4,"triage":{"at":"2026-11-10T19:28:12Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: use-after-free lets a remote attacker run code","impact":"high","summary":"A memory bug in Microsoft Office Excel lets a use-after-free condition be triggered over a network. An unauthorized attacker could use it to execute code on the victim's machine.","audience":"everyone","category":"package","nicknames":[],"who_cares":["microsoft-office","excel","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the victim's machine over the network","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-118732 for affected builds, fixed versions and whether user interaction is required.","how_to_check":"- unknown","plain_action":"Update Microsoft Excel through Microsoft's update channel once Microsoft publishes a fix; the sources do not name a fixed version.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Anyone running Microsoft Office Excel on a vulnerable build. The sources do not say which Excel versions or configurations are affected, or whether opening a crafted file is needed.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000675,"input_tokens":4482,"output_tokens":453,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-118732 for affected builds, fixed versions and whether user interaction is required.","search":"'-118732':15A,18A '-2026':14A,17A 'allow':65C 'attack':10A,46B,68C 'bug':27B 'code':12A,52B,71C 'condit':38B 'could':47B 'cve':13A,16A 'excel':2A,19B,31B,64C 'execut':51B,70C 'free':6A,37B,60C 'let':7A,32B 'machin':57B 'memori':26B 'microsoft':1A,21B,29B,62C 'microsoft-offic':20B 'network':43B,74C 'offic':22B,30B,63C 'packag':23B 'remot':9A 'run':11A 'trigger':40B 'unauthor':45B,67C 'use':4A,35B,48B,58C 'use-after-fre':3A,34B 'victim':55B 'window':24B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Microsoft Office Excel on a vulnerable build. The sources do not say which Excel versions or configurations are affected, or whether opening a crafted file is needed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":"Update Microsoft Excel through Microsoft's update channel once Microsoft publishes a fix; the sources do not name a fixed version.","pkeys":[],"ptokens":[],"labels":["excel","high","microsoftoffice","package","windows"],"campaign_type":null,"search_a":"'-118732':15A,18A '-2026':14A,17A 'attack':10A 'code':12A 'cve':13A,16A 'excel':2A 'free':6A 'let':7A 'microsoft':1A 'remot':9A 'run':11A 'use':4A 'use-after-fre':3A","search_b":"'attack':46B 'bug':27B 'code':52B 'condit':38B 'could':47B 'excel':19B,31B 'execut':51B 'free':37B 'let':32B 'machin':57B 'memori':26B 'microsoft':21B,29B 'microsoft-offic':20B 'network':43B 'offic':22B,30B 'packag':23B 'trigger':40B 'unauthor':45B 'use':35B,48B 'use-after-fre':34B 'victim':55B 'window':24B","search_c":"'allow':65C 'attack':68C 'code':71C 'excel':64C 'execut':70C 'free':60C 'microsoft':62C 'network':74C 'offic':63C 'unauthor':67C 'use':58C","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:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118732","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118732","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"}