CVE-2026-55054

MEDIUM

Microsoft Excel Information Disclosure Vulnerability

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Microsoft Excel Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55054

Scores

CVSS v3 6.5
EPSS 0.0062
EPSS Percentile 46.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-125
Status published
Products (18)
microsoft/365_apps (2 CPE variants)
microsoft/excel 2016 (2 CPE variants)
Microsoft/Microsoft 365 Apps for Enterprise 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Excel 2016 16.0.0.0 - 16.0.5561.1001
Microsoft/Microsoft Office 2019 19.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 365 for Mac 1.0.0 - 16.111.26071215
Microsoft/Microsoft Office LTSC 2021 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2024 16.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC for Mac 2021 16.0.1 - 16.111.26071215
Microsoft/Microsoft Office LTSC for Mac 2024 16.0.0 - 16.111.26071215
... and 8 more
Published Jul 14, 2026
Tracked Since Jul 14, 2026