CVE-2026-54108: Microsoft SharePoint Server Spoofing Vulnerability

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

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

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jul

Released

2026-07-14

Description

External control of file name or path in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

FAQ

I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running? Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.

Affected Products (3)

Microsoft Office

• Microsoft SharePoint Enterprise Server 2016
• Microsoft SharePoint Server 2019
• Microsoft SharePoint Server Subscription Edition

Security Updates (3)

• 5002891
• 5002883
• 5002882

Acknowledgments

<a href="https://twitter.com/chudypb">Piotr Bazydło (@chudypb)</a>, 41ae55e9310ff27fa6f26af4727e5590

Revision History

• 2026-07-14: Information published.