What is CVE-2026-40368?

CVE-2026-40368 is a high-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Deserialization of Untrusted Data. CVSS score: 8.0/10. Published 2026-05-12.

How severe is CVE-2026-40368?

High severity. CVSS v3 base score is 8.0 out of 10.

Deserialization in Microsoft Sharepoint Enterprise Server 2016

CVE-2026-40368

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

Vulnerability class: Insecure Deserialization

EPSS: 0.005 (65.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

Affected products

Microsoft Sharepoint Enterprise Server 2016 — versions 16.0.0
Microsoft Sharepoint Server 2019 — versions 16.0.0
Microsoft Sharepoint Server Subscription Edition — versions 16.0.0
Microsoft Sharepoint_server — versions 2016, 2019

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

Microsoft SharePoint Server Remote Code Execution Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40368?: CVE-2026-40368 is a high-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Deserialization of Untrusted Data. CVSS score: 8.0/10. Published 2026-05-12.
How severe is CVE-2026-40368?: High severity. CVSS v3 base score is 8.0 out of 10.