CVE-2026-70329: Microsoft 365 Apps

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Office 2019: affected versions not specified
• Microsoft Office 2021: affected versions not specified
• Microsoft Office 2024: affected versions not specified
• Microsoft Outlook: version 2016 only

Published 2026-08-11. Last modified 2026-08-14.