CVE-2019-1109: Microsoft Office

Critical severity, CVSS 9.1. EPSS: 4.2% chance of exploitation in the next 30 days.

A spoofing vulnerability exists when Microsoft Office Javascript does not check the validity of the web page making a request to Office documents.An attacker who successfully exploited this vulnerability could read or write information in Office documents.The security update addresses the vulnerability by correcting the way that Microsoft Office Javascript verifies trusted web pages., aka 'Microsoft Office Spoofing Vulnerability'.

Affected products

• Microsoft Office: version 2013 only; version 2016 only; version 2019 only
• Microsoft Office 365: affected versions not specified

Published 2019-07-15. Last modified 2026-06-17.