Improper Authorization in Microsoft SharePoint Server - CVE-2026-58277
Published: July 17, 2026
Vulnerability identifier: #VU138283
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-58277
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to elevate privileges.
The vulnerability exists due to improper authorization in Microsoft Office SharePoint when handling network requests. A remote user can send crafted requests to elevate privileges.
A successful exploit grants the rights of the user running the affected application.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-58277
Install security update from vendor's website.
Microsoft SharePoint Server - addressed in versions 16.0.5561.1001, 16.0.10417.20175