What is CVE-2026-42831?

CVE-2026-42831 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Microsoft Office Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-42831 cover?

CVE-2026-42831 covers the following CVE IDs: CVE-2026-42831. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-42831?

CVE-2026-42831 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-42831?

CVE-2026-42831 affects 3 products, including: Microsoft Office LTSC for Mac 2021; Microsoft Office LTSC for Mac 2024; Microsoft Office for Android.

CVE-2026-42831CriticalCVSS 7.8

Microsoft Office Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-42831 →

📋 Description

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

🎯 Affected products3

Microsoft Office LTSC for Mac 2021
Microsoft Office LTSC for Mac 2024
Microsoft Office for Android

✅ Remediation

KBRelease Notes (Security Update) — fixed build 16.109.26051019 KBRelease Notes (Security Update) — fixed build 16.0.19822.20190

🔗 References (4)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831
patchhttps://go.microsoft.com/fwlink/p/?linkid=831049
patchhttps://play.google.com/store/apps/details?id=com.microsoft.office.officehubrow
referencehttps://support.google.com/googleplay/answer/113412?hl=en