CVE-2026-70318: Microsoft 365 Apps

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

Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Microsoft 365: 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
• Microsoft Word: version 2016 only

Published 2026-08-11. Last modified 2026-08-12.