CVE-2026-58277: Microsoft SharePoint Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

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

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jul

Released

2026-07-14

Description

Improper authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges 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. What privileges could be gained by an attacker who successfully exploited the vulnerability? The attacker would gain the rights of the user that is running the affected application.

Affected Products (2)

Microsoft Office

• Microsoft SharePoint Enterprise Server 2016
• Microsoft SharePoint Server 2019

Security Updates (2)

• 5002891
• 5002883

Acknowledgments

Rafael Resende, Rafael Resende

Revision History

• 2026-07-14: Information published.