CVE-2026-31957CRITICAL 10.0EPSS p38.9%

CVE-2026-31957CVE-2026-31957

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.

Scoring

CVSS 3.110.0 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS0.50% probability of exploitation · percentile 38.9% · 2026-06-18T12:00:27Z
Published2026-03-11
Last modified2026-03-16

Underlying weaknesses· 1

CWE-1188

References

  1. https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-q746-m2wv-qh4v

1

TypeTargetConfidenceTier
WeaknessInitialization of a Resource with an Insecure Defaultcwe-11880%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.