Microsoft SharePoint Server Remote Code Execution Vulnerability

Summary

Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network. Published in August 2026 Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely.

Why it matters

Microsoft published this item through its Security Update Guide, making it part of Patch Tuesday triage for affected Windows, cloud, or application estates.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-63520. Confirm whether Microsoft Office SharePoint is deployed, then apply the current security update or documented mitigation. CVSS score: 8.1.

Sources