Microsoft SharePoint Elevation of Privilege Vulnerability
CVE-2026-45484

8.8HIGH

Key Information:

Vendor: Microsoft
Status: Microsoft Sharepoint Enterprise Server 2016; Microsoft Sharepoint Server 2019; Microsoft Sharepoint Server Subscription Edition
Vendor: CVE Published:; 9 June 2026

What is CVE-2026-45484?

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

Microsoft SharePoint Enterprise Server 2016 x64-based Systems 16.0.0 < 16.0.5556.1005

Microsoft SharePoint Server 2019 x64-based Systems 16.0.0 < 16.0.10417.20153

Microsoft SharePoint Server Subscription Edition x64-based Systems 16.0.0 < 16.0.19725.20384

Score:

8.8

Severity:

HIGH

Confidentiality:

High

Integrity:

High

Availability:

High

Attack Vector:

Network

Attack Complexity:

Low

Privileges Required:

Low

User Interaction:

None

Scope:

Unchanged

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CVE-2026-45484 Data