CVE-2026-45484: Microsoft SharePoint Server

High severity, CVSS 8.8. EPSS: 2.3% chance of exploitation in the next 30 days.

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

Affected products

• Microsoft SharePoint Server: before 16.0.19725.20384 (fixed in 16.0.19725.20384); version 2016 only; version 2019 only

Published 2026-06-09. Last modified 2026-07-23.