{"id":"CVE-2026-32201","kind":"vulnerability","aliases":["CVE-2026-32201"],"related":[],"title":"microsoft sharepoint server: Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a…","description":"Microsoft SharePoint Server contains an improper input validation vulnerability that allows an unauthorized attacker to perform spoofing over a network.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Microsoft SharePoint Server has an improper input validation flaw that lets an unauthorized attacker perform spoofing over the network. CISA lists it as actively exploited in the wild.","severity":"medium","cvss":6.5,"epss":null,"exploited":true,"exploited_at":"2026-04-14T00:00:00+00:00","products":[{"name":"microsoft sharepoint server","fixed":["16.0.19725.20210"],"affected":"< 16.0.19725.20210","ecosystem":"vendor"},{"name":"microsoft sharepoint server","fixed":[],"affected":"= 2016","ecosystem":"vendor"},{"name":"microsoft sharepoint server","fixed":[],"affected":"= 2019","ecosystem":"vendor"},{"name":"Microsoft SharePoint Server","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","on-premises","other","sharepoint-server"],"not_affected_if":["sharepoint-online"],"how_to_check":null,"fix":"Apply the mitigations from Microsoft's vendor instructions, per the CISA required action; the sources do not name a patched build.","status":"open","published_at":"2026-04-14T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:38:49+00:00","updated_at":"2026-10-24T00:09:50+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-10-23T20:38:49Z","model":"claude-haiku-5-5","output":{"fix":"Apply the mitigations from Microsoft's vendor instructions, per the CISA required action; the sources do not name a patched build.","reach":"network","summary":"Microsoft SharePoint Server has an improper input validation flaw that lets an unauthorized attacker perform spoofing over the network. CISA lists it as actively exploited in the wild.","category":"other","who_cares":["sharepoint-server","on-premises"],"confidence":0.5,"needs_auth":"no","worst_case":"unknown","analyst_note":"Find the Microsoft advisory for CVE-2026-32201 to get affected builds, patched versions, and the exact mitigation steps; the KEV entry alone gives none of these.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["sharepoint-online"],"user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000414,"input_tokens":2537,"output_tokens":320,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':104C '-2026':19A,22A '-32201':20A,23A '22':103C 'action':94C 'activ':67B 'allow':11A,82C 'appli':95C 'applic':101C 'attack':14A,57B,85C 'bod':102C 'cisa':63B,92C 'cloud':107C 'contain':75C 'cve':18A,21A 'discontinu':110C 'exploit':36B,68B 'flaw':52B 'follow':100C 'guidanc':105C 'improp':4A,49B,77C 'input':5A,50B,78C 'instruct':99C 'let':54B 'list':64B 'microsoft':1A,8A,24A,27A,30A,33A,44B,72C 'mitig':96C,116C 'network':62B,91C 'offic':9A 'on-premis':37B 'per':97C 'perform':16A,58B,87C 'premis':39B 'product':114C 'requir':93C 'server':3A,26A,29A,32A,35A,43B,46B,74C 'servic':108C 'sharepoint':2A,10A,25A,28A,31A,34A,42B,45B,73C 'sharepoint-serv':41B 'spoof':17A,59B,88C 'unauthor':13A,56B,84C 'unavail':118C 'use':111C 'valid':6A,51B,79C 'vendor':98C 'vulner':80C 'wild':71B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-04-14T00:00:00+00:00","kev":{"dateAdded":"2026-04-14","dueDate":"2026-04-28","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2026-32201","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-32201","severity":null,"published_at":"2026-04-14T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T11:39:14+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-32201","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32201","severity":null,"published_at":"2026-04-14T18:17:27+00:00","modified_at":"2026-06-17T10:35:20+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}