CVE-2025-59232: Microsoft Excel Information Disclosure Vulnerability

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-14 · updated 2026-06-17
Weakness: CWE-125

Description

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

Affected products

Microsoft 365 Apps: all versions
Microsoft Access: 2016
Microsoft Excel 2013 Service Pack 1: 2016
Microsoft Office: 2019
Microsoft Office LTSC for Mac 2021: 2021, 2024
Microsoft Office Online Server: before 16.0.10417.20059 — fixed in 16.0.10417.20059
Microsoft SharePoint Server: 2016, 2019
Microsoft 365 Apps: from 16.0.1 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
Microsoft Access 2016: from 16.0.0 before 16.0.5522.1000 — fixed in 16.0.5522.1000
Microsoft Access 2016 (32-bit edition): from 16.0.0 before 16.0.5522.1000 — fixed in 16.0.5522.1000
Microsoft Excel 2016: from 16.0.0.0 before 16.0.5522.1000 — fixed in 16.0.5522.1000
Microsoft Office LTSC 2021: from 16.0.1 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2024: from 16.0.0 before 16.102.25101223 — fixed in 16.102.25101223
Microsoft Office: from 19.0.0 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024: from 16.0.0 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2021: from 16.0.1 before 16.102.25101223 — fixed in 16.102.25101223
Microsoft Office Online Server: from 16.0.0.0 before 16.0.10417.20059 — fixed in 16.0.10417.20059
Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5522.1000 — fixed in 16.0.5522.1000
Microsoft SharePoint Server: from 16.0.0 before 16.0.10417.20059 — fixed in 16.0.10417.20059

How to fix

Upgrade to a fixed version: Microsoft Office Online Server 16.0.10417.20059; Microsoft 365 Apps https://aka.ms/OfficeSecurityReleases; Microsoft Access 2016 16.0.5522.1000; Microsoft Access 2016 (32-bit edition) 16.0.5522.1000; Microsoft Excel 2016 16.0.5522.1000; Microsoft Office LTSC 2021 https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC for Mac 2024 16.102.25101223; Microsoft Office https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC 2024 https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC for Mac 2021 16.102.25101223; Microsoft Office Online Server 16.0.10417.20059; Microsoft Sharepoint Enterprise Server 2016 16.0.5522.1000. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59232

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