Cross-Site Scripting Vulnerability in Microsoft Office SharePoint
CVE-2026-70355

7.3HIGH

Key Information:

Vendor

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

What is CVE-2026-70355?

The vulnerability in Microsoft Office SharePoint arises from improper neutralization of user inputs during web page generation, allowing unauthorized users to exploit this weakness. An attacker with the right access can craft malicious inputs that manipulate the SharePoint application, leading to unauthorized privilege elevation and potential data leakage over the network. It is crucial for users and administrators to apply patches and follow security best practices to mitigate risks associated with this vulnerability.

Affected Version(s)

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:
7.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.