Missing Authentication for Critical Function in Microsoft SharePoint Server - CVE-2026-56164
Published: July 14, 2026
Vulnerability identifier: #VU137541
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2026-56164
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Microsoft
Affected software:
Microsoft SharePoint Server
Microsoft SharePoint Server
Detailed vulnerability description
The vulnerability allows a remote attacker to gain unauthorized access to the application.
The vulnerability exists due to missing authentication for critical function. A remote non-authenticated attacker can send a specially crafted HTTP request and modify certain data.
Note, the vulnerability is being actively exploited in the wild.
How to mitigate CVE-2026-56164
Install updates from vendor's website.