HOMEVULNERABILITIESCVE-2026-40379
CRITICAL

CVE-2026-40379

CWE-200Published: May 12, 2026· Updated: May 13, 2026

9.3
CVSS v3.1
EPSS:0.06%probability of exploitation in 30 daysPercentile:18.5th

Official Description

Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.

NVD Source

Technical Analysis

CVE-2026-40379 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.3.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeChanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
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All References (1)

Quick Facts

CVE IDCVE-2026-40379
CVSS Score9.3 / 10
SeverityCRITICAL
WeaknessCWE-200
CISA KEVNo
EPSS (30d)0.06%
PublishedMay 12, 2026

Related CVEs (CWE-200)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2026-40379 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.