Main Vulnerability Database Vulnerabilities #VU131340

Insufficient Granularity of Access Control in Microsoft products - CVE-2026-40365

Published: May 13, 2026

Vulnerability identifier: #VU131340

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-40365

CWE-ID: CWE-1220

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insufficient granularity of access control in Microsoft SharePoint Server. A remote user can execute arbitrary code on the system.

Affected software

Microsoft SharePoint Enterprise Server
Microsoft SharePoint Server
Microsoft SharePoint Server Subscription Edition

How to mitigate CVE-2026-40365

Install updates from vendor's website.

Microsoft SharePoint Enterprise Server - update to 16.0.5552.1002
Microsoft SharePoint Server - update to 16.0.10417.20128
Microsoft SharePoint Server Subscription Edition - update to 16.0.19725.20280

External References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40365

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