Deserialization of Untrusted Data in Microsoft products - CVE-2026-40368
Published: May 13, 2026
Vulnerability identifier: #VU131341
CSH Severity: Medium
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-40368
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in Microsoft SharePoint Server. A remote user can trick a victim to connect to a malicious server and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Microsoft SharePoint Enterprise Server
Microsoft SharePoint Server
Microsoft SharePoint Server Subscription Edition
Microsoft SharePoint Server
Microsoft SharePoint Server Subscription Edition
How to mitigate CVE-2026-40368
Install updates from vendor's website.
Microsoft SharePoint Enterprise Server - update to 16.0.5552.1002
Microsoft SharePoint Server - update to 16.0.10417.20128
Microsoft SharePoint Server Subscription Edition - update to 16.0.19725.20280
Microsoft SharePoint Server - update to 16.0.10417.20128
Microsoft SharePoint Server Subscription Edition - update to 16.0.19725.20280