Main Vulnerability Database Vulnerabilities #VU165121

Use-after-free in Microsoft products - CVE-2026-118716

Published: November 11, 2026

Vulnerability identifier: #VU165121

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-2026-118716

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 on the affected system.

The vulnerability exists due to use-after-free in Microsoft Office Excel when processing a specially crafted file. A remote attacker can trick a user into opening the file to execute arbitrary code on the affected system.

The Preview Pane is not an attack vector for this vulnerability.

Affected software

Microsoft Office for macOS
Microsoft Office
Office Online Server

How to mitigate CVE-2026-118716

Install security update from vendor's website.

Microsoft Office for macOS - update to 16.115.26110837
Office Online Server - update to 16.0.10417.20236
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-118716

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