PT-2026-58550 · Microsoft · 365 Apps For Enterprise+8

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-55046

NVD

CVSS v3.1

5.5

Medium

Base vector

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

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

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-55046

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-2026-55046 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-55046 · Security Note