What is CVE-2026-40365?

CVE-2026-40365 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Microsoft SharePoint Server Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-40365 cover?

CVE-2026-40365 covers the following CVE IDs: CVE-2026-40365. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40365?

CVE-2026-40365 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-40365?

CVE-2026-40365 affects 3 products, including: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.

CVE-2026-40365CriticalCVSS 8.8

Microsoft SharePoint Server Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-40365 →

📋 Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

🎯 Affected products3

Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft SharePoint Server Subscription Edition

✅ Remediation

KB5002868 (Security Update) — fixed build 16.0.5552.1002 KB5002870 (Security Update) — fixed build 16.0.10417.20128 KB5002863 (Security Update) — fixed build 16.0.19725.20280

🔗 References (7)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40365
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108651
referencehttps://support.microsoft.com/help/5002868
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108654
referencehttps://support.microsoft.com/help/5002870
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108655
referencehttps://support.microsoft.com/help/5002863