CVE-2026-21258

MEDIUM

Microsoft Office Excel - Info Disclosure

Title source: llm
STIX 2.1

Description

Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

References (1)

Scores

CVSS v3 5.5
EPSS 0.0006
EPSS Percentile 19.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/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-20 CWE-125
Status published
Products (14)
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 - 16.0.5539.1002
Microsoft/Microsoft Office 2019 19.0.0 - https://aka.ms/OfficeSecurityReleases
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 - 16.106.26020821
Microsoft/Microsoft Office LTSC for Mac 2024 16.0.0 - 16.106.26020821
microsoft/office 2019 (2 CPE variants)
... and 4 more
Published Feb 10, 2026
Tracked Since Feb 18, 2026