Missing Authorization in Microsoft SharePoint Server - CVE-2026-55052

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Main Vulnerability Database Vulnerabilities #VU138280

Missing Authorization in Microsoft SharePoint Server - CVE-2026-55052

Published: July 17, 2026


Vulnerability identifier: #VU138280
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-2026-55052
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Microsoft
Affected software:
Microsoft SharePoint Server

Detailed vulnerability description

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.


How to mitigate CVE-2026-55052

Install security update from vendor's website.

Sources