Missing Authorization in Microsoft SharePoint Server - CVE-2026-55052
Published: July 17, 2026
Vulnerability identifier: #VU138280
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-2026-55052
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to escalate privileges.
The vulnerability exists due to missing authorization in Microsoft Office SharePoint when handling network requests. A remote user can send crafted requests to escalate privileges.
The attacker gains the rights of the user running the affected application.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-55052
Install security update from vendor's website.
Microsoft SharePoint Server - addressed in versions 16.0.5561.1001, 16.0.10417.20175, 16.0.19725.20434