CVE-2026-31957: 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…

PriorityP268critical10CVSS 3.1

AVNACLPRNUINSCCHIHAH

EPSS

0.50%

39.1th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
himmelblau-idm	himmelblau	< 3.1.0	3.1.0
himmelblau-idm	himmelblau	—	—

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