Microsoft Excel Information Disclosure Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81958
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-08 18:20:59 UTC
Updated2026-09-09 14:03:52 UTC
DescriptionUse of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS: 0.003930000 probability, percentile 0.327100000 (date 2026-09-09)

Problem Types: CWE-908 | CWE-908 CWE-908: Use of Uninitialized Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
3.1CNACVSS5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft 365 Apps - All All All
Application Microsoft 365 Apps - All All All
Application Microsoft Excel 2016 All All All
Application Microsoft Excel 2016 All All All
Application Microsoft Microsoft 365 - All All All
Application Microsoft Office 2016 - All All All
Application Microsoft Office 2016 - All All All
Application Microsoft Office 2019 - All All All
Application Microsoft Office 2019 - All All All
Application Microsoft Office 2021 - All All All
Application Microsoft Office 2021 - All All All
Application Microsoft Office 2021 - All All All
Application Microsoft Office 2024 - All All All
Application Microsoft Office 2024 - All All All
Application Microsoft Office 2024 - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Microsoft 365 Apps For Enterprise affected 16.0.1 16.0.20326.20138 custom 32-bit Systems, x64-based Systems
CNA Microsoft Microsoft Excel 2016 affected 16.0.0.0 16.0.5569.1003 custom 32-bit Systems, x64-based Systems
CNA Microsoft Microsoft Office 2016 affected 16.0.0 16.0.5569.1003 custom 32-bit Systems, x64-based Systems
CNA Microsoft Microsoft Office 2019 affected 19.0.0 16.0.10417.20207 custom 32-bit Systems, x64-based Systems
CNA Microsoft Microsoft Office 365 For Mac affected - Not specified
CNA Microsoft Microsoft Office LTSC 2021 affected 16.0.1 16.0.14334.20906 custom 32-bit Systems, x64-based Systems
CNA Microsoft Microsoft Office LTSC 2024 affected 16.0.0 16.0.17932.20976 custom 32-bit Systems, x64-based Systems
CNA Microsoft Microsoft Office LTSC For Mac 2021 affected - Not specified
CNA Microsoft Microsoft Office LTSC For Mac 2024 affected - Not specified

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81958 [email protected] msrc.microsoft.com Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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