Cross-Site Scripting Vulnerability in Microsoft SharePoint by Microsoft
CVE-2026-45453

5.4MEDIUM

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-2026-45453?

A vulnerability in Microsoft SharePoint allows for improper input neutralization during the web page generation process. This flaw can lead to cross-site scripting (XSS) attacks, enabling an authorized attacker to execute malicious scripts in a user's browser session through spoofing. This can potentially compromise confidential information and lead to unauthorized actions within the SharePoint environment.

Affected Version(s)

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

References

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

vendor-advisorypatch

CVSS V3.1

Score:

5.4

Severity:

MEDIUM

Confidentiality:

Low

Integrity:

Low

Availability:

Low

Attack Vector:

Network

Attack Complexity:

Low

Privileges Required:

None

User Interaction:

Required

Scope:

Unchanged

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Jun 9, 2026
Vulnerability Reserved
May 12, 2026

CVE-2026-45453 Data

JSON