CVE-2026-102859: Microsoft Office SharePoint Spoofing Vulnerability

Overview

Severity

Medium (CVSS 4.6)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Oct

Released

2026-10-13

Description

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.

FAQ

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

Affected Products (1)

Microsoft Office

• Microsoft SharePoint Server Subscription Edition

Security Updates (1)

• 5002927

Revision History

• 2026-10-13: Information published.