{"id":"CVE-2026-109464","kind":"vulnerability","aliases":["CVE-2026-109464"],"related":[],"title":"Microsoft SharePoint: untrusted data lets an authorized user run code","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","summary":"Microsoft SharePoint deserializes untrusted data without proper checks. An attacker with a valid account can run code over the network.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office SharePoint","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["microsoft-office","sharepoint","vendor"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:15+00:00","first_seen_at":"2026-11-10T19:24:24+00:00","triaged_at":"2026-11-10T19:34:00+00:00","updated_at":"2026-11-10T19:34:00+00:00","category":"vendor","confidence":0.5,"triage":{"at":"2026-11-10T19:34:00Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft SharePoint: untrusted data lets an authorized user run code","impact":"high","summary":"Microsoft SharePoint deserializes untrusted data without proper checks. An attacker with a valid account can run code over the network.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["sharepoint","microsoft-office"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"code runs on the SharePoint server","analyst_note":"Find Microsoft's advisory for CVE-2026-109464 to confirm affected builds, fixed versions and mitigations.","how_to_check":"unknown","plain_action":"","product_name":"Microsoft Office SharePoint","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":0.000628,"input_tokens":4495,"output_tokens":357,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find Microsoft's advisory for CVE-2026-109464 to confirm affected builds, fixed versions and mitigations.","search":"'-109464':13A,16A '-2026':12A,15A 'account':38B 'allow':53C 'attack':34B,56C 'author':7A,55C 'check':32B 'code':10A,41B,59C 'cve':11A,14A 'data':4A,29B,48C 'deseri':27B,45C 'execut':58C 'let':5A 'microsoft':1A,17A,21B,25B,50C 'microsoft-offic':20B 'network':44B,62C 'offic':22B,51C 'office':18A 'proper':31B 'run':9A,40B 'sharepoint':2A,19A,23B,26B,52C 'untrust':3A,28B,47C 'user':8A 'valid':37B 'vendor':24B 'without':30B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["microsoftofficesharepoint","officesharepoint"],"ptokens":["microsoft","office","sharepoint"],"labels":["high","microsoftoffice","sharepoint","vendor"],"campaign_type":null,"search_a":"'-109464':13A,16A '-2026':12A,15A 'author':7A 'code':10A 'cve':11A,14A 'data':4A 'let':5A 'microsoft':1A,17A 'office':18A 'run':9A 'sharepoint':2A,19A 'untrust':3A 'user':8A","search_b":"'account':38B 'attack':34B 'check':32B 'code':41B 'data':29B 'deseri':27B 'microsoft':21B,25B 'microsoft-offic':20B 'network':44B 'offic':22B 'proper':31B 'run':40B 'sharepoint':23B,26B 'untrust':28B 'valid':37B 'vendor':24B 'without':30B","search_c":"'allow':53C 'attack':56C 'author':55C 'code':59C 'data':48C 'deseri':45C 'execut':58C 'microsoft':50C 'network':62C 'offic':51C 'sharepoint':52C 'untrust':47C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:15+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-2026-109464","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109464","severity":null,"published_at":"2026-11-10T19:18:15+00:00","modified_at":"2026-11-10T19:18:15+00:00","first_seen_at":"2026-11-10T19:24:24+00:00","fetched_at":"2026-11-10T19:24:24+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"}