Defender for Office 365, Identity, Cloud and IoT
CVE-2025-26685: Microsoft Defender for Identity Spoofing Vulnerability
Improper authentication in Microsoft Defender for Identity allows an unauthorized attacker to perform spoofing over an adjacent network.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 6.5
EPSS0.73%Chance of exploitation in 30 days
Public exploitNot tracked
FixNot yet
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Microsoft Defender for Identity - | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Improper authentication in Microsoft Defender for Identity allows an unauthorized attacker to perform spoofing over an adjacent network.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.