CVE-2026-108446: Microsoft 365 Apps For Enterprise

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Affected products

• Microsoft Microsoft 365 Apps For Enterprise
• Microsoft Microsoft Office 365 For Mac: from 1.0.0, before 16.114.26101123 (fixed in 16.114.26101123)
• Microsoft Microsoft Office Ltsc 2021: from 16.0.1, before 16.0.14334.20974 (fixed in 16.0.14334.20974)
• Microsoft Microsoft Office Ltsc 2024: from 16.0.0, before 16.0.17932.21056 (fixed in 16.0.17932.21056)
• Microsoft Microsoft Office Ltsc For Mac 2021: from 16.0.1, before 16.114.26101123 (fixed in 16.114.26101123)
• Microsoft Microsoft Office Ltsc For Mac 2024: from 16.0.0, before 16.114.26101123 (fixed in 16.114.26101123)
• Microsoft Office Online Server: from 16.0.0.0, before 16.0.10417.20228 (fixed in 16.0.10417.20228)

Published 2026-10-15. Last modified 2026-10-17.