What is CVE-2026-20963?

CVE-2026-20963 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft SharePoint Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-20963 cover?

CVE-2026-20963 covers the following CVE IDs: CVE-2026-20963. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-20963?

CVE-2026-20963 has a CVSS v3 base score of 9.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-20963?

CVE-2026-20963 affects 3 products, including: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.

CVE-2026-20963HighCVSS 9.8

Microsoft SharePoint Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-20963 →

📋 Description

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

🎯 Affected products3

Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft SharePoint Server Subscription Edition

✅ Remediation

KB5002828 (Security Update) — fixed build 16.0.5535.1001 KB5002825 (Security Update) — fixed build 16.0.10417.20083 KB5002822 (Security Update) — fixed build 16.0.19127.20442

🔗 References (7)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108518
referencehttps://support.microsoft.com/help/5002828
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108525
referencehttps://support.microsoft.com/help/5002825
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108517
referencehttps://support.microsoft.com/help/5002822