Main Vulnerability Database Vulnerabilities #VU141815

Type Confusion in Microsoft Office for macOS and Microsoft Excel - CVE-2026-65807

Published: August 12, 2026

Vulnerability identifier: #VU141815

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-2026-65807

CWE-ID: CWE-843

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 access of resource using incompatible type ('type confusion') in Microsoft Excel when parsing a specially crafted file. A remote attacker can send a specially crafted file to the victim 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

How to mitigate CVE-2026-65807

Install security update from vendor's website.

Microsoft Office for macOS - update to 16.112.26081010
Microsoft Excel - update to 16.0.5565.1001

External References

Related Security Bulletins