PT-2026-58523 · Microsoft · 365 Apps For Enterprise+7

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-55018

NVD

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-55018

Affected Products

365 Apps For Enterprise

Office 2016

Office 2019

Office 365 For Mac

Office Ltsc 2021

Office Ltsc 2024

Office Ltsc For Mac 2021

Office Ltsc For Mac 2024

References · 2

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55018 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-55018 · Security Note