{ "document": { "acknowledgments": [ { "names": [ "f7d8c52bec79e42795cf15888b85cbad" ] } ], "aggregate_severity": { "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system", "text": "Critical" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Public", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en-US", "notes": [ { "category": "general", "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle", "title": "Additional Resources" }, { "category": "legal_disclaimer", "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.", "title": "Disclaimer" }, { "category": "general", "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.", "title": "Customer Action" } ], "publisher": { "category": "vendor", "contact_details": "secure@microsoft.com", "name": "Microsoft Security Response Center", "namespace": "https://msrc.microsoft.com" }, "references": [ { "category": "self", "summary": "CVE-2026-40365 Microsoft SharePoint Server Remote Code Execution Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40365" }, { "category": "self", "summary": "CVE-2026-40365 Microsoft SharePoint Server Remote Code Execution Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40365.json" }, { "category": "external", "summary": "Microsoft Exploitability Index", "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1" }, { "category": "external", "summary": "Microsoft Support Lifecycle", "url": "https://support.microsoft.com/lifecycle" }, { "category": "external", "summary": "Common Vulnerability Scoring System", "url": "https://www.first.org/cvss" } ], "title": "Microsoft SharePoint Server Remote Code Execution Vulnerability", "tracking": { "current_release_date": "2026-05-12T07:00:00.000Z", "generator": { "date": "2026-05-14T18:07:41.949Z", "engine": { "name": "MSRC Generator", "version": "1.0" } }, "id": "msrc_CVE-2026-40365", "initial_release_date": "2026-05-12T07:00:00.000Z", "revision_history": [ { "date": "2026-05-12T07:00:00.000Z", "legacy_version": "1", "number": "1", "summary": "Information published." } ], "status": "final", "version": "1" } }, "product_tree": { "branches": [ { "branches": [ { "category": "product_version_range", "name": "<16.0.5552.1002", "product": { "name": "Microsoft SharePoint Enterprise Server 2016 <16.0.5552.1002", "product_id": "3" } }, { "category": "product_version", "name": "16.0.5552.1002", "product": { "name": "Microsoft SharePoint Enterprise Server 2016 16.0.5552.1002", "product_id": "10950" } } ], "category": "product_name", "name": "Microsoft SharePoint Enterprise Server 2016" }, { "branches": [ { "category": "product_version_range", "name": "<16.0.10417.20128", "product": { "name": "Microsoft SharePoint Server 2019 <16.0.10417.20128", "product_id": "2" } }, { "category": "product_version", "name": "16.0.10417.20128", "product": { "name": "Microsoft SharePoint Server 2019 16.0.10417.20128", "product_id": "11585" } } ], "category": "product_name", "name": "Microsoft SharePoint Server 2019" }, { "branches": [ { "category": "product_version_range", "name": "<16.0.19725.20280", "product": { "name": "Microsoft SharePoint Server Subscription Edition <16.0.19725.20280", "product_id": "1" } }, { "category": "product_version", "name": "16.0.19725.20280", "product": { "name": "Microsoft SharePoint Server Subscription Edition 16.0.19725.20280", "product_id": "11961" } } ], "category": "product_name", "name": "Microsoft SharePoint Server Subscription Edition" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-40365", "cwe": { "id": "CWE-1220", "name": "Insufficient Granularity of Access Control" }, "notes": [ { "category": "general", "text": "Microsoft", "title": "Assigning CNA" }, { "category": "faq", "text": "Any authenticated attacker could trigger this vulnerability. It does not require admin or other elevated privileges.", "title": "According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?" }, { "category": "faq", "text": "In a network-based attack, an authenticated attacker, as at least a Site Owner, could write arbitrary code to inject and execute code remotely on the SharePoint Server.", "title": "How could an attacker exploit the vulnerability?" }, { "category": "faq", "text": "Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.", "title": "I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?" } ], "product_status": { "fixed": [ "10950", "11585", "11961" ], "known_affected": [ "1", "2", "3" ] }, "references": [ { "category": "self", "summary": "CVE-2026-40365 Microsoft SharePoint Server Remote Code Execution Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40365" }, { "category": "self", "summary": "CVE-2026-40365 Microsoft SharePoint Server Remote Code Execution Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40365.json" } ], "remediations": [ { "category": "vendor_fix", "date": "2026-05-12T07:00:00.000Z", "details": "16.0.5552.1002:Security Update:https://support.microsoft.com/help/5002868", "product_ids": [ "3" ], "url": "https://support.microsoft.com/help/5002868" }, { "category": "vendor_fix", "date": "2026-05-12T07:00:00.000Z", "details": "16.0.10417.20128:Security Update:https://support.microsoft.com/help/5002870", "product_ids": [ "2" ], "url": "https://support.microsoft.com/help/5002870" }, { "category": "vendor_fix", "date": "2026-05-12T07:00:00.000Z", "details": "16.0.19725.20280:Security Update:https://support.microsoft.com/help/5002863", "product_ids": [ "1" ], "url": "https://support.microsoft.com/help/5002863" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "environmentalsScore": 0.0, "exploitCodeMaturity": "UNPROVEN", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "remediationLevel": "OFFICIAL_FIX", "reportConfidence": "CONFIRMED", "scope": "UNCHANGED", "temporalScore": 7.7, "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C", "version": "3.1" }, "products": [ "1", "2", "3" ] } ], "threats": [ { "category": "impact", "details": "Remote Code Execution" }, { "category": "exploit_status", "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely" } ], "title": "Microsoft SharePoint Server Remote Code Execution Vulnerability" } ] }