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CVE-2025-53736: Microsoft Word Information Disclosure Vulnerability

• Severity: medium (CVSS 6.2 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: 2025-08-12 · updated 2026-06-17
• Weakness: CWE-126

Description

Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Affected products

• Microsoft 365 Apps: all versions
• Microsoft Office: 2019
• Microsoft Office LTSC for Mac 2021: 2021, 2024
• Microsoft SharePoint Server: 2016
• Microsoft SharePoint Server: 2019
• Microsoft Word for Android: 2016
• Microsoft 365 Apps: from 16.0.1 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
• 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 16.100.25081015 — fixed in 16.100.25081015
• Microsoft Word 2016: from 16.0.1 before 16.0.5513.1000 — fixed in 16.0.5513.1000
• 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 16.100.25081015 — fixed in 16.100.25081015
• Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5513.1002 — fixed in 16.0.5513.1002
• Microsoft SharePoint Server: from 16.0.0 before 16.0.10417.20041 — fixed in 16.0.10417.20041

How to fix

Upgrade to a fixed version: Microsoft 365 Apps https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC 2021 https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC for Mac 2024 16.100.25081015; Microsoft Word 2016 16.0.5513.1000; Microsoft Office https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC 2024 https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC for Mac 2021 16.100.25081015; Microsoft Sharepoint Enterprise Server 2016 16.0.5513.1002; Microsoft SharePoint Server 16.0.10417.20041. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53736

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