CVE-2019-1109

Office vulnerability

CVSS

9.1

EPSS

4.2%

EPSS pct

90th

Exploited

No known

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 vendor

Microsoft

Affected product

Office

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2019-07-15

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity.

Its EPSS score of 4.2% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2019-1109

Confirm whether Microsoft Office is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-1109.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-1109

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-1109 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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