Deserialization of Untrusted Data in Microsoft products - CVE-2026-45484
Published: June 10, 2026
Vulnerability identifier: #VU134161
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-2026-45484
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. A remote user can pass specially crafted data to the application 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-2026-45484
Install updates from vendor's website.
Microsoft SharePoint Enterprise Server - update to 16.0.5556.1005
Microsoft SharePoint Server - update to 16.0.10417.20153
Microsoft SharePoint Server Subscription Edition - update to 16.0.19725.20384
Microsoft SharePoint Server - update to 16.0.10417.20153
Microsoft SharePoint Server Subscription Edition - update to 16.0.19725.20384