Main Vulnerability Database Vulnerabilities #VU138246

Use-after-free in Microsoft Office for macOS and Office Online Server - CVE-2026-54131

Published: July 17, 2026

Vulnerability identifier: #VU138246

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-2026-54131

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 parsing a crafted Office file. A remote attacker can send a specially crafted file and convince the victim 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
Office Online Server

How to mitigate CVE-2026-54131

Install security update from vendor's website.

Microsoft Office for macOS - update to 16.111.26071215
Office Online Server - update to 16.0.10417.20175

External References

Related Security Bulletins