High MSRC-CVE-2026-102864 1 CVE

Microsoft Office SharePoint Spoofing Vulnerability

Published Oct 13, 2026 · Updated Oct 13, 2026

Vendor: Microsoft

Summary

Impact: Spoofing. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.

Security updates
16.0.20326.20190 — https://support.microsoft.com/help/5002927

Vulnerabilities 1

Medium 4.6

CVE-2026-102864

Microsoft Office SharePoint Spoofing Vulnerability

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

Microsoft Microsoft SharePoint Server Subscription Edition

Oct 13, 2026

Revision history

2026-10-13 #1
Information published.

References

CVE-2026-102864 Microsoft Office SharePoint Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102864
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss