What is CVE-2026-63520?

CVE-2026-63520 is a high-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2026-08-11.

How severe is CVE-2026-63520?

High severity. CVSS v3 base score is 8.1 out of 10.

Improper input validation in Microsoft Sharepoint Enterprise Server 2016

CVE-2026-63520

Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

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

Frequently asked questions

What is CVE-2026-63520?: CVE-2026-63520 is a high-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2026-08-11.
How severe is CVE-2026-63520?: High severity. CVSS v3 base score is 8.1 out of 10.