{"id":"CVE-2026-123395","kind":"vulnerability","aliases":["CVE-2026-123395"],"related":[],"title":"Microsoft Excel: code injection lets a local user disclose information","description":"Improper control of generation of code ('code injection') in Microsoft Office Excel allows an authorized attacker to disclose information locally.","summary":"A flaw in Microsoft Office Excel lets an authorized local user generate code in a way that discloses information. The sources describe information disclosure only, with no remote execution stated.","severity":"medium","cvss":5.9,"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":"2026-11-10T19:20:43+00:00","first_seen_at":"2026-11-10T19:25:13+00:00","triaged_at":"2026-11-10T19:59:54+00:00","updated_at":"2026-11-10T19:59:54+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:59:54Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Microsoft Excel: code injection lets a local user disclose information","impact":"low","summary":"A flaw in Microsoft Office Excel lets an authorized local user generate code in a way that discloses information. The sources describe information disclosure only, with no remote execution stated.","audience":"businesses","category":"other","nicknames":[],"who_cares":["excel","microsoft-office","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"Some information is disclosed to an authorized local user.","analyst_note":"Check the NVD entry and Microsoft's security update guide for affected builds, the fixed build, and whether user interaction (opening a file) is required.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Machines running Microsoft Office Excel where a user already has authorized local access. The sources do not name affected versions or any non-default setting, so the exact exposure is unknown.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000649,"input_tokens":4496,"output_tokens":398,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-123395':13A,16A '-2026':12A,15A 'allow':65C 'attack':68C 'author':31B,67C 'code':3A,35B,58C,59C 'control':54C 'cve':11A,14A 'describ':44B 'disclos':9A,40B,70C 'disclosur':46B 'excel':2A,17B,28B,64C 'execut':51B 'flaw':24B 'generat':34B,56C 'improp':53C 'inform':10A,41B,45B,71C 'inject':4A,60C 'let':5A,29B 'local':7A,32B,72C 'microsoft':1A,19B,26B,62C 'microsoft-offic':18B 'offic':20B,27B,63C 'remot':50B 'sourc':43B 'state':52B 'user':8A,33B 'way':38B 'window':22B","nicknames":[],"mitigations":[],"who_affected":"Machines running Microsoft Office Excel where a user already has authorized local access. The sources do not name affected versions or any non-default setting, so the exact exposure is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["excel","medium","microsoftoffice","other","windows"],"campaign_type":null,"search_a":"'-123395':13A,16A '-2026':12A,15A 'code':3A 'cve':11A,14A 'disclos':9A 'excel':2A 'inform':10A 'inject':4A 'let':5A 'local':7A 'microsoft':1A 'user':8A","search_b":"'author':31B 'code':35B 'describ':44B 'disclos':40B 'disclosur':46B 'excel':17B,28B 'execut':51B 'flaw':24B 'generat':34B 'inform':41B,45B 'let':29B 'local':32B 'microsoft':19B,26B 'microsoft-offic':18B 'offic':20B,27B 'remot':50B 'sourc':43B 'state':52B 'user':33B 'way':38B 'window':22B","search_c":"'allow':65C 'attack':68C 'author':67C 'code':58C,59C 'control':54C 'disclos':70C 'excel':64C 'generat':56C 'improp':53C 'inform':71C 'inject':60C 'local':72C 'microsoft':62C 'offic':63C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:43+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123395","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123395","severity":null,"published_at":"2026-11-10T19:20:43+00:00","modified_at":"2026-11-10T19:20:43+00:00","first_seen_at":"2026-11-10T19:25:13+00:00","fetched_at":"2026-11-10T19:25:13+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"}