CVE-2026-40365: CWE-1220: Insufficient Granularity of Access Control in Microsoft Microsoft SharePoint Enterprise Server 2016
Insufficient granularity of access control in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40365) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) and is classified under CWE-1220 for insufficient granularity of access control. It enables an attacker with some level of authorization to execute arbitrary code remotely over the network. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected SharePoint server, potentially leading to full compromise of confidentiality, integrity, and availability of the system. This could result in unauthorized data access, modification, or disruption of services.
Mitigation Recommendations
An official patch is available from Microsoft to remediate this vulnerability. Administrators should apply the update provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40365 promptly. Since this is not a cloud service, remediation requires manual patching of affected on-premises SharePoint servers.
CVE-2026-40365: CWE-1220: Insufficient Granularity of Access Control in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Insufficient granularity of access control in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40365) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) and is classified under CWE-1220 for insufficient granularity of access control. It enables an attacker with some level of authorization to execute arbitrary code remotely over the network. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected SharePoint server, potentially leading to full compromise of confidentiality, integrity, and availability of the system. This could result in unauthorized data access, modification, or disruption of services.
Mitigation Recommendations
An official patch is available from Microsoft to remediate this vulnerability. Administrators should apply the update provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40365 promptly. Since this is not a cloud service, remediation requires manual patching of affected on-premises SharePoint servers.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-11T23:06:15.614Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40365","vendor":"Microsoft"}]
Threat ID: 6a036550cbff5d861008c8f2
Added to database: 5/12/2026, 5:37:20 PM
Last enriched: 5/12/2026, 6:53:14 PM
Last updated: 5/13/2026, 4:09:43 AM
Views: 2
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