What is CVE-2026-70329?

CVE-2026-70329 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft Outlook Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-70329 cover?

CVE-2026-70329 covers the following CVE IDs: CVE-2026-70329. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-70329?

CVE-2026-70329 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-70329?

CVE-2026-70329 affects 10 products, including: Microsoft 365 Apps for Enterprise for 32-bit Systems; Microsoft 365 Apps for Enterprise for 64-bit Systems; Microsoft Office 2019 for 32-bit editions; Microsoft Office 2019 for 64-bit editions; Microsoft Office LTSC 2021 for 32-bit editions; and others — see the full list on the advisory page.

CVE-2026-70329HighCVSS 8.8

Microsoft Outlook Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-70329 →

📋 Description

Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

🎯 Affected products10

Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems
Microsoft Office 2019 for 32-bit editions
Microsoft Office 2019 for 64-bit editions
Microsoft Office LTSC 2021 for 32-bit editions
Microsoft Office LTSC 2021 for 64-bit editions
Microsoft Office LTSC 2024 for 32-bit editions
Microsoft Office LTSC 2024 for 64-bit editions
Microsoft Outlook 2016 (32-bit edition)
Microsoft Outlook 2016 (64-bit edition)

✅ Remediation

KBClick to Run (Security Update) — fixed build https://aka.ms/OfficeSecurityReleases KB5002755 (Security Update) — fixed build 16.0.5565.1000

🔗 References (4)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70329
referencehttps://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108768
referencehttps://support.microsoft.com/help/5002755