Feb 2026: Microsoft Outlook Spoofing Vulnerability
CVE-2026-21260 Published on February 10, 2026
Microsoft Outlook Spoofing Vulnerability
Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-21260 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-21260
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases 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.
- Version 16.0.0.0 and below 16.0.5539.1002 is affected.
- Version 16.0.0 and below 16.0.5539.1002 is affected.
- Version 16.0.0 and below 16.0.10417.20097 is affected.
- Version 16.0.0 and below 16.0.19127.20518 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.