Use-after-free in Microsoft products - CVE-2026-108446
Published: November 5, 2026
Vulnerability identifier: #VU159366
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-108446
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the affected system.
The vulnerability exists due to use-after-free in Microsoft Office Excel when processing a specially crafted file. A remote attacker can trick a user into opening the file to execute arbitrary code on the affected system.
The Preview Pane is not an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Office
Office Online Server
Microsoft Office
Office Online Server
How to mitigate CVE-2026-108446
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.114 26101123
Office Online Server - update to 16.0.10417.20228
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056
Office Online Server - update to 16.0.10417.20228
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056