Elevation of Privilege Vulnerability in Microsoft Office SharePoint
CVE-2026-64921

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Sharepoint Enterprise Server 2016
Microsoft Sharepoint Server 2019
Microsoft Sharepoint Server Subscription Edition
Vendor
CVE Published:
11 August 2026

What is CVE-2026-64921?

The vulnerability allows an unauthorized attacker to exploit missing authentication for critical functions in Microsoft Office SharePoint, enabling them to elevate their privileges over a network. This can lead to unauthorized access to sensitive information and control over SharePoint resources. Organizations using affected versions of Microsoft Office SharePoint are advised to apply patches and review their security configurations to mitigate potential risks.

Affected Version(s)

Microsoft SharePoint Enterprise Server 2016 x64-based Systems 16.0.0 < 16.0.5565.1001

Microsoft SharePoint Server 2019 x64-based Systems 16.0.0 < 16.0.10417.20198

Microsoft SharePoint Server Subscription Edition x64-based Systems 16.0.0 < 16.0.19725.20522

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

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

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.