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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: Himmelblau (Azure Entra ID auth module) fails to restrict authentication scope when **Tenant Domain** is unconfigured.โฆ
๐ก๏ธ **Root Cause**: **CWE-1188** (Insecure Configuration of Required Security Settings). The flaw lies in the logic: missing tenant config = no boundary enforcement.โฆ
๐ฆ **Affected**: Product **himmelblau** by vendor **himmelblau-idm**. ๐ **Version**: All versions **prior to 3.1.0**. If you are running 3.0.x or earlier, you are vulnerable.
Q4What can hackers do? (Privileges/Data)
๐ **Attacker Capabilities**: Full compromise! CVSS **9.8 (Critical)**. ๐ฏ **Privileges**: Can authenticate as users from **arbitrary** Entra ID tenants.โฆ
๐ **Public Exploit**: **No**. The `pocs` field is empty. ๐ **Reference**: Official advisory exists on GitHub (GHSA-q746-m2wv-qh4v), but no public PoC code is available yet.โฆ
๐ **Self-Check**: 1. Check your Himmelblau version (must be < 3.1.0). 2. Audit config: Is **Tenant Domain** explicitly set? 3. If null/empty, you are vulnerable.โฆ
โ **Official Fix**: **YES**. ๐ **Patch**: Upgrade to version **3.1.0** or later. The vendor has released a fix addressing the scope restriction logic. ๐ **Published**: March 11, 2026.
Q9What if no patch? (Workaround)
๐ง **No Patch Workaround**: If you cannot upgrade immediately, **MUST** configure the **Tenant Domain** explicitly in the settings. ๐ Do not leave it blank.โฆ