{"id":"CVE-2026-109499","kind":"vulnerability","aliases":["CVE-2026-109499"],"related":[],"title":"Microsoft SharePoint: type confusion lets an authorized user run code","description":"Access of resource using incompatible type ('type confusion') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","summary":"Microsoft Office SharePoint has a type confusion flaw, where code reads a resource as the wrong type. An authorized attacker on the network can execute code.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","sharepoint","vendor"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:18+00:00","first_seen_at":"2026-11-10T19:24:25+00:00","triaged_at":"2026-11-10T19:33:52+00:00","updated_at":"2026-11-10T19:33:52+00:00","category":"vendor","confidence":0.5,"triage":{"at":"2026-11-10T19:33:52Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft SharePoint: type confusion lets an authorized user run code","impact":"high","summary":"Microsoft Office SharePoint has a type confusion flaw, where code reads a resource as the wrong type. An authorized attacker on the network can execute code.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["sharepoint","microsoft-office"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"Attacker runs code on the SharePoint server over the network","analyst_note":"Confirm affected SharePoint builds and the Microsoft advisory's patch and fixed versions for CVE-2026-109499.","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":"high"},"cost_usd":0.000622,"input_tokens":4501,"output_tokens":343,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Confirm affected SharePoint builds and the Microsoft advisory's patch and fixed versions for CVE-2026-109499.","search":"'-109499':13A,16A '-2026':12A,15A 'access':48C 'allow':60C 'attack':41B,63C 'author':7A,40B,62C 'code':10A,31B,47B,66C 'confus':4A,28B,55C 'cve':11A,14A 'execut':46B,65C 'flaw':29B 'incompat':52C 'let':5A 'microsoft':1A,18B,22B,57C 'microsoft-offic':17B 'network':44B,69C 'offic':19B,23B,58C 'read':32B 'resourc':34B,50C 'run':9A 'sharepoint':2A,20B,24B,59C 'type':3A,27B,38B,53C,54C 'use':51C 'user':8A 'vendor':21B 'wrong':37B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","sharepoint","vendor"],"campaign_type":null,"search_a":"'-109499':13A,16A '-2026':12A,15A 'author':7A 'code':10A 'confus':4A 'cve':11A,14A 'let':5A 'microsoft':1A 'run':9A 'sharepoint':2A 'type':3A 'user':8A","search_b":"'attack':41B 'author':40B 'code':31B,47B 'confus':28B 'execut':46B 'flaw':29B 'microsoft':18B,22B 'microsoft-offic':17B 'network':44B 'offic':19B,23B 'read':32B 'resourc':34B 'sharepoint':20B,24B 'type':27B,38B 'vendor':21B 'wrong':37B","search_c":"'access':48C 'allow':60C 'attack':63C 'author':62C 'code':66C 'confus':55C 'execut':65C 'incompat':52C 'microsoft':57C 'network':69C 'offic':58C 'resourc':50C 'sharepoint':59C 'type':53C,54C 'use':51C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:18+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-109499","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109499","severity":null,"published_at":"2026-11-10T19:18:18+00:00","modified_at":"2026-11-10T19:18:19+00:00","first_seen_at":"2026-11-10T19:24:25+00:00","fetched_at":"2026-11-10T19:24:25+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"}