CVE-2026-45459: Microsoft 365 Apps

Low severity, CVSS 3.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Microsoft 365: 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.