Cross-Site Scripting Vulnerability in Microsoft Office SharePoint
CVE-2026-88204

7.3HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Sharepoint Server Subscription Edition
Vendor
CVE Published:
13 October 2026

What is CVE-2026-88204?

A vulnerability in Microsoft Office SharePoint involves the improper neutralization of inputs during webpage generation, allowing an authorized attacker to execute spoofing attacks across networks. This flaw can be exploited through crafted input that manipulates trusted content, leading clients to believe that responses are from legitimate sources. It underscores the importance of input validation and securing web applications against XSS threats. Users should ensure they have the latest security updates to mitigate such risks.

Affected Version(s)

Microsoft SharePoint Server Subscription Edition x64-based Systems 16.0.0 < 16.0.20326.20190

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

.