PT-2026-58548 · Microsoft · 365 Apps For Enterprise+8

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-55044

Mitre

CVSS v3.1

7.8

High

Base vector

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

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-55044

Affected Products

365 Apps For Enterprise

Excel 2016

Office 2019

Office 365 For Mac

Office Ltsc 2021

Office Ltsc 2024

Office Ltsc For Mac 2021

Office Ltsc For Mac 2024

Office Online Server

References · 2

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55044 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-55044 · Security Note