{"id":"CVE-2026-110044","kind":"vulnerability","aliases":["CVE-2026-110044"],"related":[],"title":"Microsoft SharePoint: untrusted data deserialization 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 mishandles untrusted serialized data, so a user with a valid account can make the server execute code over the network. Sources rate it high (CVSS 8.8) and do not report active exploitation.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","on-premises","sharepoint","vendor"],"not_affected_if":["sharepoint-online"],"how_to_check":"- Check the installed SharePoint Server build against Microsoft's security update guide for CVE-2026-110044","fix":null,"status":"open","published_at":"2026-11-10T19:18:20+00:00","first_seen_at":"2026-11-10T19:24:26+00:00","triaged_at":"2026-11-10T19:32:37+00:00","updated_at":"2026-11-10T19:32:37+00:00","category":"vendor","confidence":0.5,"triage":{"at":"2026-11-10T19:32:37Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft SharePoint: untrusted data deserialization lets an authorized user run code","impact":"high","summary":"Microsoft SharePoint mishandles untrusted serialized data, so a user with a valid account can make the server execute code over the network. Sources rate it high (CVSS 8.8) and do not report active exploitation.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["sharepoint","microsoft-office","on-premises"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"authorized user runs code on the SharePoint server","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-110044 for affected builds and the patch; the sources give neither.","how_to_check":"- Check the installed SharePoint Server build against Microsoft's security update guide for CVE-2026-110044\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["sharepoint-online"],"who_is_affected":"Organizations running Microsoft SharePoint Server on-premises where users can sign in. The sources do not name affected versions or a configuration that limits exposure. SharePoint Online is not described in the sources.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000687,"input_tokens":4495,"output_tokens":476,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-110044 for affected builds and the patch; the sources give neither.","search":"'-110044':14A,17A '-2026':13A,16A '8.8':53B 'account':38B 'activ':58B 'allow':68C 'attack':71C 'author':8A,70C 'code':11A,44B,74C 'cve':12A,15A 'cvss':52B 'data':4A,31B,63C 'deseri':5A,60C 'execut':43B,73C 'exploit':59B 'high':51B 'let':6A 'make':40B 'microsoft':1A,19B,26B,65C 'microsoft-offic':18B 'mishandl':28B 'network':47B,77C 'offic':20B,66C 'on-premis':21B 'premis':23B 'rate':49B 'report':57B 'run':10A 'serial':30B 'server':42B 'sharepoint':2A,24B,27B,67C 'sourc':48B 'untrust':3A,29B,62C 'user':9A,34B 'valid':37B 'vendor':25B","nicknames":[],"mitigations":[],"who_affected":"Organizations running Microsoft SharePoint Server on-premises where users can sign in. The sources do not name affected versions or a configuration that limits exposure. SharePoint Online is not described in the sources.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","onpremises","sharepoint","vendor"],"campaign_type":null,"search_a":"'-110044':14A,17A '-2026':13A,16A 'author':8A 'code':11A 'cve':12A,15A 'data':4A 'deseri':5A 'let':6A 'microsoft':1A 'run':10A 'sharepoint':2A 'untrust':3A 'user':9A","search_b":"'8.8':53B 'account':38B 'activ':58B 'code':44B 'cvss':52B 'data':31B 'execut':43B 'exploit':59B 'high':51B 'make':40B 'microsoft':19B,26B 'microsoft-offic':18B 'mishandl':28B 'network':47B 'offic':20B 'on-premis':21B 'premis':23B 'rate':49B 'report':57B 'serial':30B 'server':42B 'sharepoint':24B,27B 'sourc':48B 'untrust':29B 'user':34B 'valid':37B 'vendor':25B","search_c":"'allow':68C 'attack':71C 'author':70C 'code':74C 'data':63C 'deseri':60C 'execut':73C 'microsoft':65C 'network':77C 'offic':66C 'sharepoint':67C 'untrust':62C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:20+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-2026-110044","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110044","severity":null,"published_at":"2026-11-10T19:18:20+00:00","modified_at":"2026-11-10T19:18:20+00:00","first_seen_at":"2026-11-10T19:24:26+00:00","fetched_at":"2026-11-10T19:24:26+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"}