CVE-2026-81401: Microsoft 365 Apps

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

Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Excel: version 2016 only
• Microsoft Microsoft 365: 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
• Microsoft Office Online Server: before 16.0.10417.20207 (fixed in 16.0.10417.20207)

Published 2026-09-08. Last modified 2026-09-17.