Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-111298
Published: November 11, 2026
Vulnerability identifier: #VU164796
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-2026-111298
CWE-ID: CWE-125
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 an out-of-bounds read in Microsoft Office Word when processing specially crafted files. A remote attacker can convince a user to first open a crafted HTML file, then open a Word document in the same running instance of Word and save that document as a web page to execute arbitrary code with the user's permissions.
The Preview Pane is not an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-111298
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