CVE-2026-42832: Microsoft Office Spoofing Vulnerability

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-12 · updated 2026-10-26
Weakness: CWE-284

Description

Improper access control in Microsoft Office allows an unauthorized attacker to perform spoofing locally.

Affected products

Microsoft Excel 2013 Service Pack 1: before 16.0.19822.20190 — fixed in 16.0.19822.20190
Microsoft Office: 2024
Microsoft Office LTSC for Mac 2021: 2021
Microsoft Word for Android: before 16.0.19822.20190 — fixed in 16.0.19822.20190
Microsoft Excel for Android: from 16.0.0.0 before 16.0.19822.20190 — fixed in 16.0.19822.20190
Microsoft Office LTSC for Mac 2024: from 16.0.0 before 16.109.26051019 — fixed in 16.109.26051019
Microsoft Office LTSC for Mac 2021: from 16.0.1 before 16.109.26051019 — fixed in 16.109.26051019
Microsoft Word for Android: from 16.0.0.0 before 16.0.19822.20190 — fixed in 16.0.19822.20190

How to fix

Upgrade to a fixed version: Microsoft Excel 2013 Service Pack 1 16.0.19822.20190; Microsoft Word for Android 16.0.19822.20190; Microsoft Excel for Android 16.0.19822.20190; Microsoft Office LTSC for Mac 2024 16.109.26051019; Microsoft Office LTSC for Mac 2021 16.109.26051019; Microsoft Word for Android 16.0.19822.20190. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42832

Get alerted when CVE-2026-42832 or the next vulnerability affects your stack