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Himmelblau CVE-2026-45108

| EUVD-2026-32633 HIGH
Incorrect Authorization (CWE-863)
2026-05-27 GitHub_M
Authentication Bypass Microsoft Himmelblau
8.4
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

Lifecycle Timeline

3
Patch available
May 27, 2026 - 21:04 EUVD
Analysis Generated
May 27, 2026 - 20:37 vuln.today
CVE Published
May 27, 2026 - 18:53 nvd
HIGH 8.4

DescriptionNVD

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 2.0.0 to before 3.1.5 and 2.3.11, Himmelblau contained an authentication bypass vulnerability in the Device Authorization Grant (DAG) flow that allowed a user within the same Entra ID domain to obtain a local Unix session as another user by providing their own valid credentials. The vulnerability existed in the token_validate function, which validated domain aliases for legitimate multi-domain scenarios but failed to verify that the local part (username) of the authenticated user's UPN matched the requested account username. The function only compared domains, not the complete usernames. This vulnerability is fixed in 3.1.5 and 2.3.11.

AnalysisAI

Authorization bypass in Himmelblau (the open-source Entra ID/Intune interoperability suite) versions 2.0.0 through 3.1.4 and the 2.3.x branch before 2.3.11 lets any authenticated user in the same Entra ID domain obtain a local Unix login session as a different user by presenting only their own valid credentials. The flaw lives in the token_validate function of the Device Authorization Grant flow, which matched only the domain portion of the User Principal Name and ignored the username (local part), so a low-privileged domain member can impersonate higher-value accounts on the host. …

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CVE-2026-45108 vulnerability details – vuln.today
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