Entra ID
CVE-2026-40379: Azure Entra ID Spoofing Vulnerability
Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityCRITICALCVSS 3.1 9.3
EPSS0.95%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 Entra - | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.