CVE-2026-62870: Microsoft 365 Apps

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

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Affected products

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

Published 2026-08-04. Last modified 2026-08-09.