Improper Authorization in Microsoft SharePoint Server - CVE-2026-58277
Published: July 17, 2026
Vulnerability identifier: #VU138283
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-58277
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft SharePoint Server
Microsoft SharePoint Server
Detailed vulnerability description
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.
How to mitigate CVE-2026-58277
Install security update from vendor's website.