Remote Code Execution Vulnerability in Microsoft Office SharePoint
CVE-2026-70321

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-70321?

A deserialization vulnerability in Microsoft Office SharePoint permits an authorized attacker to execute arbitrary code over a network. By exploiting this flaw, attackers can manipulate data being deserialized, potentially gaining control over the affected system. Organizations using specific versions of SharePoint should evaluate their security posture and apply necessary patches as soon as available to mitigate this risk.

Affected Version(s)

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

.