Cross-Site Scripting Vulnerability in Microsoft Office SharePoint
CVE-2026-70306

9.3CRITICAL

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-2026-70306?

This vulnerability in Microsoft Office SharePoint arises from the improper neutralization of user input during the web page generation process, creating potential avenues for unauthorized attackers to execute spoofing attacks. By exploiting this flaw, an attacker could potentially manipulate content and impersonate legitimate users, thereby compromising the integrity and security of the affected systems. It is essential for organizations using Microsoft Office SharePoint to remain vigilant and apply necessary patches to mitigate the risks associated with this vulnerability.

Affected Version(s)

Microsoft SharePoint Enterprise Server 2016 x64-based Systems 16.0.0 < 16.0.5561.1001

Microsoft SharePoint Server 2019 x64-based Systems 16.0.0 < 16.0.10417.20175

Microsoft SharePoint Server Subscription Edition x64-based Systems 16.0.0 < 16.0.19725.20434

References

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

CVSS V3.1

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.