Sep 2026: Microsoft Office Spoofing Vulnerability
CVE-2026-64918 Published on September 8, 2026
Microsoft Office Spoofing Vulnerability
Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.
Weakness Type
Insufficiently Protected Credentials
The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.
Products Associated with CVE-2026-64918
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.0 and below 16.0.5569.1003 is affected.
- Version 19.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.