Improper access control in Microsoft SharePoint Server - CVE-2026-56157
Published: July 17, 2026
Vulnerability identifier: #VU138282
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-56157
CWE-ID: CWE-284
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 spoof trusted content.
The vulnerability exists due to improper access control in Microsoft Office SharePoint when handling network requests. A remote user can send crafted requests to spoof trusted content.
The issue can lead to some loss of confidentiality and integrity, but no loss of availability.
How to mitigate CVE-2026-56157
Install security update from vendor's website.