What is CVE-2026-70321?

CVE-2026-70321 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-2026-70321 cover?

CVE-2026-70321 covers the following CVE IDs: CVE-2026-70321. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-70321?

CVE-2026-70321 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-70321?

CVE-2026-70321 affects 1 product, including: Microsoft SharePoint Server Subscription Edition.

CVE-2026-70321HighCVSS 8.8

Microsoft SharePoint Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-70321 →

📋 Description

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

🎯 Affected products1

Microsoft SharePoint Server Subscription Edition

✅ Remediation

KB5002893 (Security Update) — fixed build 16.0.19725.20522

🔗 References (3)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70321
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108767
referencehttps://support.microsoft.com/help/5002893