CVE-2026-55026

MEDIUM

Microsoft Office Information Disclosure Vulnerability

Title source: cna
STIX 2.1

Description

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Microsoft Office Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55026

Scores

CVSS v3 6.2
EPSS 0.0041
EPSS Percentile 33.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-190
Status published
Products (20)
microsoft/365_apps (2 CPE variants)
Microsoft/Microsoft 365 Apps for Enterprise 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 2016 16.0.0 - 16.0.5561.1000
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
Microsoft/Microsoft SharePoint Enterprise Server 2016 16.0.0 - 16.0.5561.1001
... and 10 more
Published Jul 14, 2026
Tracked Since Jul 14, 2026