What is CVE-2026-26105?

CVE-2026-26105 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft SharePoint Server Spoofing Vulnerability

Which CVE IDs does CVE-2026-26105 cover?

CVE-2026-26105 covers the following CVE IDs: CVE-2026-26105. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-26105?

CVE-2026-26105 has a CVSS v3 base score of 8.1, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-26105?

CVE-2026-26105 affects 3 products, including: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.

CVE-2026-26105HighCVSS 8.1

Microsoft SharePoint Server Spoofing Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-26105 →

📋 Description

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

🎯 Affected products3

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

✅ Remediation

KB5002850 (Security Update) — fixed build 16.0.5543.1000 KB5002845 (Security Update) — fixed build 16.0.10417.20102 KB5002843 (Security Update) — fixed build 16.0.19725.20076

🔗 References (7)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26105
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108572
referencehttps://support.microsoft.com/help/5002850
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108579
referencehttps://support.microsoft.com/help/5002845
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108570
referencehttps://support.microsoft.com/help/5002843