CVE-2026-20959: Microsoft SharePoint Server

Medium severity, CVSS 5.4. EPSS: 7.7% chance of exploitation in the next 30 days.

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

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.