CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2026-09-25. EPSS: 2.1% chance of exploitation in the next 30 days.

Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Affected products

• Microsoft SharePoint Server: before 16.0.19725.20522 (fixed in 16.0.19725.20522); version 2016 only; version 2019 only

Published 2026-08-11. Last modified 2026-09-26.