CVE-2026-20951: Microsoft SharePoint Server

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code locally.

Affected products

• Microsoft SharePoint Server: before 16.0.19127.20442 (fixed in 16.0.19127.20442); version 2016 only; version 2019 only

Published 2026-01-13. Last modified 2026-06-17.