Main Vulnerability Database Vulnerabilities #VU165136

Use-after-free in Microsoft products - CVE-2026-118729

Published: November 11, 2026

Vulnerability identifier: #VU165136

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-2026-118729

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.

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 a specially crafted file to execute arbitrary code.

The Preview Pane is not an attack vector.

Affected software

Microsoft Office for macOS
Microsoft Office
Office Online Server

How to mitigate CVE-2026-118729

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-2026-118729

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