{"id":"CVE-2026-118713","kind":"vulnerability","aliases":["CVE-2026-118713"],"related":[],"title":"Microsoft Excel: use-after-free lets a network attacker run code","description":"Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","summary":"Microsoft Excel has a use-after-free memory flaw that an attacker can trigger over a network to execute code. The sources do not say which Excel versions are affected or what fix Microsoft shipped.","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":"2026-11-10T19:19:46+00:00","first_seen_at":"2026-11-10T19:24:53+00:00","triaged_at":"2026-11-10T19:28:26+00:00","updated_at":"2026-11-10T19:28:26+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-10T19:28:26Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: use-after-free lets a network attacker run code","impact":"high","summary":"Microsoft Excel has a use-after-free memory flaw that an attacker can trigger over a network to execute code. The sources do not say which Excel versions are affected or what fix Microsoft shipped.","audience":"everyone","category":"package","nicknames":[],"who_cares":["microsoft-office","excel","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"attacker runs code on the computer over the network","analyst_note":"Check Microsoft's MSRC advisory for CVE-2026-118713 for affected Excel builds, the patch, and whether a user must open a file.","how_to_check":"unknown","plain_action":"Update Microsoft Excel through Microsoft's standard update channel once Microsoft publishes a fix; the sources do not name a version.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000647,"input_tokens":4482,"output_tokens":398,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check Microsoft's MSRC advisory for CVE-2026-118713 for affected Excel builds, the patch, and whether a user must open a file.","search":"'-118713':15A,18A '-2026':14A,17A 'affect':55B 'allow':68C 'attack':10A,37B,71C 'code':12A,45B,74C 'cve':13A,16A 'excel':2A,19B,26B,52B,67C 'execut':44B,73C 'fix':58B 'flaw':34B 'free':6A,32B,63C 'let':7A 'memori':33B 'microsoft':1A,21B,25B,59B,65C 'microsoft-offic':20B 'network':9A,42B,77C 'offic':22B,66C 'packag':23B 'run':11A 'say':50B 'ship':60B 'sourc':47B 'trigger':39B 'unauthor':70C 'use':4A,30B,61C 'use-after-fre':3A,29B 'version':53B 'window':24B","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 Microsoft publishes a fix; the sources do not name a version.","pkeys":[],"ptokens":[],"labels":["excel","high","microsoftoffice","package","windows"],"campaign_type":null,"search_a":"'-118713':15A,18A '-2026':14A,17A 'attack':10A 'code':12A 'cve':13A,16A 'excel':2A 'free':6A 'let':7A 'microsoft':1A 'network':9A 'run':11A 'use':4A 'use-after-fre':3A","search_b":"'affect':55B 'attack':37B 'code':45B 'excel':19B,26B,52B 'execut':44B 'fix':58B 'flaw':34B 'free':32B 'memori':33B 'microsoft':21B,25B,59B 'microsoft-offic':20B 'network':42B 'offic':22B 'packag':23B 'say':50B 'ship':60B 'sourc':47B 'trigger':39B 'use':30B 'use-after-fre':29B 'version':53B 'window':24B","search_c":"'allow':68C 'attack':71C 'code':74C 'excel':67C 'execut':73C 'free':63C 'microsoft':65C 'network':77C 'offic':66C 'unauthor':70C 'use':61C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:46+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-2026-118713","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118713","severity":null,"published_at":"2026-11-10T19:19:46+00:00","modified_at":"2026-11-10T19:19:46+00:00","first_seen_at":"2026-11-10T19:24:53+00:00","fetched_at":"2026-11-10T19:24:53+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"}