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CVE-2025-29816: Microsoft Word Security Feature Bypass Vulnerability

• Severity: high (CVSS 7.5 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: 2025-04-08 · updated 2026-08-10
• Weakness: CWE-349

Description

Improper input validation in Microsoft Office Word allows an unauthorized attacker to bypass a security feature over a network.

Affected products

• Microsoft 365 Apps: all versions
• Microsoft Office: 2016, 2019
• Microsoft Office LTSC for Mac 2021: 2021, 2024
• 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 16.96.25041326 — fixed in 16.96.25041326
• Microsoft Word 2016: from 16.0.1 before 16.0.5495.1002 — fixed in 16.0.5495.1002
• Microsoft Office: from 16.0.0 before 16.0.5495.1002 — fixed in 16.0.5495.1002
• 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 16.96.25041326 — fixed in 16.96.25041326

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 16.96.25041326; Microsoft Word 2016 16.0.5495.1002; Microsoft Office 16.0.5495.1002; Microsoft Office LTSC 2024 https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC for Mac 2021 16.96.25041326. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29816

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