Stack-based buffer overflow in Microsoft Office for macOS and Microsoft Office - CVE-2026-111287
Published: November 11, 2026
Vulnerability identifier: #VU164785
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-2026-111287
CWE-ID: CWE-121
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 a stack-based buffer overflow in Microsoft Office Word when exporting a specially crafted document as a web page. A remote attacker can trick a user into saving a specially crafted document as a web page to execute arbitrary code.
Exploitation requires the Allow PNG as a graphics format setting to be enabled in Word's Web Options. This export configuration is outside the attacker's direct control.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-111287
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