Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 3.0.0 to before 3.1.0, if Himmelblau is deployed without a configured tenant domain in himmelblau.conf, authentication is not tenant-scoped. In this mode, Himmelblau can accept authentication attempts for arbitrary Entra ID domains by dynamically registering providers at runtime. This behavior is intended for initial/local bootstrap scenarios, but it can create risk in remote authentication environments. This vulnerability is fixed in 3.1.0.
Advisories

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Fixes

Solution

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Workaround

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History

Mon, 16 Mar 2026 19:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:himmelblau-idm:himmelblau:*:*:*:*:*:*:*:*

Thu, 12 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 12 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Himmelblau-idm
Himmelblau-idm himmelblau
Vendors & Products Himmelblau-idm
Himmelblau-idm himmelblau

Wed, 11 Mar 2026 19:45:00 +0000

Type Values Removed Values Added
Description Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 3.0.0 to before 3.1.0, if Himmelblau is deployed without a configured tenant domain in himmelblau.conf, authentication is not tenant-scoped. In this mode, Himmelblau can accept authentication attempts for arbitrary Entra ID domains by dynamically registering providers at runtime. This behavior is intended for initial/local bootstrap scenarios, but it can create risk in remote authentication environments. This vulnerability is fixed in 3.1.0.
Title Himmelblau unset domain configuration can allow any-tenant authentication at first login for remote deployments
Weaknesses CWE-1188
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-12T20:00:41.000Z

Reserved: 2026-03-10T15:40:10.480Z

Link: CVE-2026-31957

cve-icon Vulnrichment

Updated: 2026-03-12T20:00:37.797Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-11T20:16:16.447

Modified: 2026-03-16T19:39:37.913

Link: CVE-2026-31957

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-12T09:56:43Z

Weaknesses