CVE-2026-63529: Microsoft 365 Apps

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Affected products

• Microsoft 365 Apps: 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 2026-08-11. Last modified 2026-08-14.