What is CVE-2026-56164?

CVE-2026-56164 is a medium-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-07-14.

How severe is CVE-2026-56164?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Microsoft Sharepoint Enterprise Server 2016

CVE-2026-56164

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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-306 — Missing Authentication for Critical Function

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2026-56164?: CVE-2026-56164 is a medium-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-07-14.
How severe is CVE-2026-56164?: Medium severity. CVSS v3 base score is 5.3 out of 10.