Heap-based buffer overflow in Microsoft Office for macOS and Microsoft Excel - CVE-2026-68815
Published: August 12, 2026
Vulnerability identifier: #VU141832
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-2026-68815
CWE-ID: CWE-122
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 heap-based buffer overflow in Microsoft Office Excel when parsing a crafted Office file. A remote attacker can send a specially crafted Office file to a user and convince them to open it to execute arbitrary code.
User interaction is required to open the crafted file, and the Preview Pane is not an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Excel
Microsoft Excel
How to mitigate CVE-2026-68815
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.112.26081010
Microsoft Excel - update to 16.0.5565.1001
Microsoft Excel - update to 16.0.5565.1001