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CVE-2026-31957

Himmelblau-idm Himmelblau vulnerability

10.0 CRITICALEPSS 0.76%
  1. Published11 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Himmelblau-idm Himmelblau< 3.1.0

Remediation

Fixed in
Himmelblau-idm Himmelblau≥ 3.1.0

References

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Frequently asked

Is CVE-2026-31957 being actively exploited?

CVE-2026-31957 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.76%.

How severe is CVE-2026-31957?

CVE-2026-31957 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.76% probability of exploitation.

Which products are affected by CVE-2026-31957?

Affected products include Himmelblau-idm Himmelblau.

How do I fix CVE-2026-31957?

Upgrade affected software to a fixed version, for example Himmelblau-idm Himmelblau 3.1.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.