CVE-2020-0647: Microsoft Office Online Server

Medium severity, CVSS 5.4. EPSS: 0.9% chance of exploitation in the next 30 days.

A spoofing vulnerability exists when Office Online does not validate origin in cross-origin communications correctly, aka 'Microsoft Office Online Spoofing Vulnerability'.

Affected products

• Microsoft Office Online Server: affected versions not specified

Published 2020-01-14. Last modified 2026-06-17.