{"id":"CVE-2026-118706","kind":"vulnerability","aliases":["CVE-2026-118706"],"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 use-after-free bug in Microsoft Office Excel lets an unauthorized attacker run code over a network. The sources give no further detail on the trigger or affected versions.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office Excel","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["excel","microsoft-office","other","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:45+00:00","first_seen_at":"2026-11-10T19:24:52+00:00","triaged_at":"2026-11-10T19:29:44+00:00","updated_at":"2026-11-10T19:29:44+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:29:44Z","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 use-after-free bug in Microsoft Office Excel lets an unauthorized attacker run code over a network. The sources give no further detail on the trigger or affected versions.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-office","excel","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the machine over the network","analyst_note":"Check the NVD entry and Microsoft's security update guide for affected builds, fixed versions and whether user interaction (opening a file) is required.","how_to_check":"unknown","plain_action":"Update Microsoft Excel through Microsoft's standard update channel once a fix is listed for your version.","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":"high"},"cost_usd":0.000651,"input_tokens":4482,"output_tokens":405,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the NVD entry and Microsoft's security update guide for affected builds, fixed versions and whether user interaction (opening a file) is required.","search":"'-118706':15A,18A '-2026':14A,17A 'affect':57B 'allow':66C 'attack':10A,41B,69C 'bug':33B 'code':12A,43B,72C 'cve':13A,16A 'detail':52B 'excel':2A,21A,22B,37B,65C 'execut':71C 'free':6A,32B,61C 'give':49B 'let':7A,38B 'microsoft':1A,19A,24B,35B,63C 'microsoft-offic':23B 'network':46B,75C 'offic':25B,36B,64C 'office':20A 'remot':9A 'run':11A,42B 'sourc':48B 'trigger':55B 'unauthor':40B,68C 'use':4A,30B,59C 'use-after-fre':3A,29B 'version':58B 'window':27B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":"Update Microsoft Excel through Microsoft's standard update channel once a fix is listed for your version.","pkeys":["microsoftofficeexcel","officeexcel"],"ptokens":["excel","microsoft","office"],"labels":["excel","high","microsoftoffice","other","vendor","windows"],"campaign_type":null,"search_a":"'-118706':15A,18A '-2026':14A,17A 'attack':10A 'code':12A 'cve':13A,16A 'excel':2A,21A 'free':6A 'let':7A 'microsoft':1A,19A 'office':20A 'remot':9A 'run':11A 'use':4A 'use-after-fre':3A","search_b":"'affect':57B 'attack':41B 'bug':33B 'code':43B 'detail':52B 'excel':22B,37B 'free':32B 'give':49B 'let':38B 'microsoft':24B,35B 'microsoft-offic':23B 'network':46B 'offic':25B,36B 'run':42B 'sourc':48B 'trigger':55B 'unauthor':40B 'use':30B 'use-after-fre':29B 'version':58B 'window':27B","search_c":"'allow':66C 'attack':69C 'code':72C 'excel':65C 'execut':71C 'free':61C 'microsoft':63C 'network':75C 'offic':64C 'unauthor':68C 'use':59C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:45+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-2026-118706","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118706","severity":null,"published_at":"2026-11-10T19:19:45+00:00","modified_at":"2026-11-10T19:19:45+00:00","first_seen_at":"2026-11-10T19:24:52+00:00","fetched_at":"2026-11-10T19:24:52+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"}