Use-after-free in Microsoft Office for macOS and Microsoft Office - CVE-2026-109487
Published: November 10, 2026
Vulnerability identifier: #VU164742
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-109487
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.
The vulnerability exists due to use-after-free in Microsoft Office PowerPoint when processing specially crafted presentations, with the Preview Pane also identified as an attack vector. A remote attacker can trick a victim into opening a specially crafted presentation and interacting with its embedded content to execute arbitrary code.
Successful exploitation also requires specific timing conditions to trigger the vulnerability.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-109487
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