Use-after-free in Microsoft Office for macOS - CVE-2026-111304
Published: November 11, 2026
Vulnerability identifier: #VU164802
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-2026-111304
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 crafted Word document and convince a user to open it, insert a page break, save the document, and close it to execute arbitrary code with that user's permissions.
The Preview Pane is not an exploitation vector.
Affected software
Microsoft Office for macOS
How to mitigate CVE-2026-111304
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.115.26110837