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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.
Use CWE-1188, Microsoft vendor hub and Awaiting Analysis product page to widen CVE-2026-31957 into its surrounding weakness, vendor, and product context.
Additional editorial context is available in The Weekly Cybersecurity Brief: March 15th, 2026 and Weekly Security Roundup: Navigating the April 2026 Threat Landscape and Critical Framework Exploits.