Use-after-free in Microsoft Office for macOS and Microsoft Office - CVE-2026-110067
Published: November 11, 2026
Vulnerability identifier: #VU164781
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-2026-110067
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 with the victim user's permissions.
The vulnerability exists due to use-after-free in Microsoft Office Word when processing a specially crafted document. A remote attacker can provide a malicious Word document and convince a user to open it, save it as Rich Text Format, and dismiss the conversion and document-protection prompts to execute arbitrary code with the user's permissions.
The Preview Pane is also an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-110067
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.115.26110837
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140