What is CVE-2026-70355?

CVE-2026-70355 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft SharePoint Server Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-70355 cover?

CVE-2026-70355 covers the following CVE IDs: CVE-2026-70355. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-70355?

CVE-2026-70355 has a CVSS v3 base score of 7.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-70355?

CVE-2026-70355 affects 2 products, including: Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.

CVE-2026-70355HighCVSS 7.3

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-70355 →

📋 Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

🎯 Affected products2

Microsoft SharePoint Server 2019
Microsoft SharePoint Server Subscription Edition

✅ Remediation

KB5002894 (Security Update) — fixed build 16.0.10417.20198 KB5002896 (Security Update) — fixed build 16.0.10417.20198 KB5002893 (Security Update) — fixed build 16.0.19725.20522

🔗 References (7)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108774
referencehttps://support.microsoft.com/help/5002894
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108773
referencehttps://support.microsoft.com/help/5002896
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108767
referencehttps://support.microsoft.com/help/5002893