Microsoft Office
CVE-2019-1109 — Microsoft Office Spoofing Vulnerability
Executive Summary
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.
Overview
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
EPSS Score
0.0424
probability of exploitation in the next 30 days
0.89744 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
9 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Office 2013 RT Service Pack 1 | 4018375 (Security Update) 4018375 (Security Update) 4018375 (Security Update) |
Important | Spoofing | Maybe |
| Microsoft Office 2013 Service Pack 1 (32-bit editions) | 4018375 (Security Update) 4018375 (Security Update) 4018375 (Security Update) |
Important | Spoofing | Maybe |
| Microsoft Office 2013 Service Pack 1 (64-bit editions) | 4018375 (Security Update) 4018375 (Security Update) 4018375 (Security Update) |
Important | Spoofing | Maybe |
| Microsoft Office 2016 (32-bit edition) | 4464534 (Security Update) 4464534 (Security Update) |
Important | Spoofing | Maybe |
| Microsoft Office 2016 (64-bit edition) | 4464534 (Security Update) 4464534 (Security Update) |
Important | Spoofing | Maybe |
| Microsoft Office 2019 for 32-bit editions | Click to Run (Security Update) Click to Run (Security Update) |
Important | Spoofing | No |
| Microsoft Office 2019 for 64-bit editions | Click to Run (Security Update) Click to Run (Security Update) |
Important | Spoofing | No |
| Office 365 ProPlus for 32-bit Systems | Click to Run (Security Update) Click to Run (Security Update) |
Important | Spoofing | No |
| Office 365 ProPlus for 64-bit Systems | Click to Run (Security Update) Click to Run (Security Update) |
Important | Spoofing | No |
Patches
3 patches
| Article | Type | Restart |
|---|---|---|
4018375 (Security Update) 4018375 (Security Update) 4018375 |
Security Update | Maybe |
4464534 (Security Update) 4464534 |
Security Update | Maybe |
Click to Run (Security Update) Click to Run |
Security Update | No |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Microsoft has not published researcher acknowledgments for this CVE, or they are not yet reflected in our data source. Check the MSRC advisory directly for the most current credit information.
References
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