CVE-2026-45474: Microsoft 365 Apps

High severity, CVSS 8.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft 365 Copilot: any version
• Microsoft Microsoft 365: affected versions not specified
• Microsoft Office 2016: 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

Published 2026-06-09. Last modified 2026-07-23.