#VU121422 Deserialization of Untrusted Data in Microsoft products - CVE-2026-20963

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Main Vulnerability Database Vulnerabilities #VU121422

#VU121422 Deserialization of Untrusted Data in Microsoft products - CVE-2026-20963

Published: January 14, 2026 / Updated: March 18, 2026


Vulnerability identifier: #VU121422
Vulnerability risk: Medium
CVSSv4.0: 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:A/U:Green
CVE-ID: CVE-2026-20963
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability: The vulnerability is being exploited in the wild
Vulnerable software:
Microsoft SharePoint Server
Microsoft SharePoint Server Subscription Edition
Microsoft SharePoint Enterprise Server
Software vendor:
Microsoft

Description

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.


Remediation

Install updates from vendor's website.

External links