CVE-2025-54910: Microsoft 365 Apps

High severity, CVSS 8.4. EPSS: 0.6% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Office: version 2016 only; version 2019 only
• Microsoft Office Long Term Servicing Channel: version 2021 only; version 2024 only

Published 2025-09-09. Last modified 2026-06-17.