What is CVE-2026-56157?

CVE-2026-56157 is a medium-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Improper Access Control. CVSS score: 5.4/10. Published 2026-07-14.

How severe is CVE-2026-56157?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Microsoft Sharepoint Enterprise Server 2016

CVE-2026-56157

Improper access control in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

EPSS: 0.005 (40.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-284 — Improper Access Control

References

Microsoft SharePoint Server Spoofing Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-56157?: CVE-2026-56157 is a medium-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Improper Access Control. CVSS score: 5.4/10. Published 2026-07-14.
How severe is CVE-2026-56157?: Medium severity. CVSS v3 base score is 5.4 out of 10.