CVE-2026-97779: Microsoft 365 Apps

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

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
• Microsoft Office Online Server: before 16.0.10417.20228 (fixed in 16.0.10417.20228)

Published 2026-10-13. Last modified 2026-10-15.