Stack-based buffer overflow in Microsoft Office for macOS - CVE-2026-66807
Published: August 12, 2026
Vulnerability identifier: #VU141986
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-2026-66807
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 stack-based buffer overflow in Microsoft Office Graphics Component when parsing a crafted Office file. A remote attacker can send a specially crafted file to execute arbitrary code.
User interaction is required to open or preview the crafted file, and the Preview Pane is an attack vector.
Affected software
Microsoft Office for macOS
How to mitigate CVE-2026-66807
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.112.26081010