CVE-2026-31957 — AI Deep Analysis Summary

🚨 **Essence**: Himmelblau (Azure Entra ID auth module) fails to restrict authentication scope when **Tenant Domain** is unconfigured.…

🛡️ **Root Cause**: **CWE-1188** (Insecure Configuration of Required Security Settings). The flaw lies in the logic: missing tenant config = no boundary enforcement.…

📦 **Affected**: Product **himmelblau** by vendor **himmelblau-idm**. 📅 **Version**: All versions **prior to 3.1.0**. If you are running 3.0.x or earlier, you are vulnerable.

💀 **Attacker Capabilities**: Full compromise! CVSS **9.8 (Critical)**. 🎯 **Privileges**: Can authenticate as users from **arbitrary** Entra ID tenants.…

⚡ **Exploitation Threshold**: **LOW**. 🚫 **Auth**: None required (PR:N). 🖱️ **UI**: None required (UI:N). 🌐 **Network**: Remote (AV:N). ⚙️ **Config**: Only requires the target to have **unconfigured** tenant domain.…

🔍 **Public Exploit**: **No**. The `pocs` field is empty. 📜 **Reference**: Official advisory exists on GitHub (GHSA-q746-m2wv-qh4v), but no public PoC code is available yet.…

🔎 **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.…

✅ **Official Fix**: **YES**. 📌 **Patch**: Upgrade to version **3.1.0** or later. The vendor has released a fix addressing the scope restriction logic. 📅 **Published**: March 11, 2026.

🚧 **No Patch Workaround**: If you cannot upgrade immediately, **MUST** configure the **Tenant Domain** explicitly in the settings. 🛑 Do not leave it blank.…

🔥 **Urgency**: **CRITICAL**. 🚨 CVSS 9.8 + Remote + No Auth + Easy Config Flaw. ⏳ **Priority**: Patch **IMMEDIATELY**.…