{"id":"CVE-2026-88176","kind":"vulnerability","aliases":["CVE-2026-88176"],"related":[],"title":"Microsoft SharePoint: missing authorization lets a logged-in user gain higher privileges","description":"Missing authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.","summary":"Microsoft Office SharePoint has a missing authorization check that lets an authorized attacker raise their privileges over the network. The attacker needs a valid account on the SharePoint server first.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","on-premises","other","sharepoint"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:26+00:00","first_seen_at":"2026-11-10T19:25:18+00:00","triaged_at":"2026-11-10T19:26:02+00:00","updated_at":"2026-11-10T19:26:02+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-10T19:26:02Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft SharePoint: missing authorization lets a logged-in user gain higher privileges","impact":"high","summary":"Microsoft Office SharePoint has a missing authorization check that lets an authorized attacker raise their privileges over the network. The attacker needs a valid account on the SharePoint server first.","audience":"businesses","category":"other","nicknames":[],"who_cares":["sharepoint","microsoft-office","on-premises"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Low-privileged user gains elevated rights over the network","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-88176 for affected builds, the fixed patch and whether SharePoint Online is affected.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organisations running Microsoft SharePoint on-premises where users hold some valid account. The sources do not list affected versions or configuration details, so unknown whether SharePoint Online is involved.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000663,"input_tokens":4492,"output_tokens":428,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-88176 for affected builds, the fixed patch and whether SharePoint Online is affected.","search":"'-2026':15A,18A '-88176':16A,19A 'account':52B 'allow':64C 'attack':40B,48B,67C 'author':4A,34B,39B,59C,66C 'check':35B 'cve':14A,17A 'elev':69C 'first':57B 'gain':11A 'higher':12A 'let':5A,37B 'log':8A 'logged-in':7A 'microsoft':1A,21B,28B,61C 'microsoft-offic':20B 'miss':3A,33B,58C 'need':49B 'network':46B,73C 'offic':22B,29B,62C 'on-premis':23B 'premis':25B 'privileg':13A,43B,70C 'rais':41B 'server':56B 'sharepoint':2A,27B,30B,55B,63C 'user':10A 'valid':51B","nicknames":[],"mitigations":[],"who_affected":"Organisations running Microsoft SharePoint on-premises where users hold some valid account. The sources do not list affected versions or configuration details, so unknown whether SharePoint Online is involved.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","onpremises","other","sharepoint"],"campaign_type":null,"search_a":"'-2026':15A,18A '-88176':16A,19A 'author':4A 'cve':14A,17A 'gain':11A 'higher':12A 'let':5A 'log':8A 'logged-in':7A 'microsoft':1A 'miss':3A 'privileg':13A 'sharepoint':2A 'user':10A","search_b":"'account':52B 'attack':40B,48B 'author':34B,39B 'check':35B 'first':57B 'let':37B 'microsoft':21B,28B 'microsoft-offic':20B 'miss':33B 'need':49B 'network':46B 'offic':22B,29B 'on-premis':23B 'premis':25B 'privileg':43B 'rais':41B 'server':56B 'sharepoint':27B,30B,55B 'valid':51B","search_c":"'allow':64C 'attack':67C 'author':59C,66C 'elev':69C 'microsoft':61C 'miss':58C 'network':73C 'offic':62C 'privileg':70C 'sharepoint':63C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:26+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-2026-88176","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88176","severity":null,"published_at":"2026-11-10T19:21:26+00:00","modified_at":"2026-11-10T19:21:26+00:00","first_seen_at":"2026-11-10T19:25:18+00:00","fetched_at":"2026-11-10T19:25:18+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"}