TI-2026-24501 Aliases CVE-2026-31957

Himmelblau unset domain configuration can allow any-tenant authentication at first login for remote deployments

MEDIUM 50CWE-1188Published 2026-03-11 · Updated 2026-03-12

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0057 47th percentileScored 2026-11-07

Fix Fixed himmelblau (himmelblau-idm): 3.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
himmelblau-idm	himmelblau	3.0.0 to before 3.1.0	3.1.0	Patch available	CNA

himmelblau Vendorhimmelblau-idm Affected 3.0.0 to before 3.1.0 Fixed in 3.1.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:himmelblau-idm:himmelblau::::::::	before 3.1.0	Vulnerable	himmelblau-idm

cpe:2.3:a:himmelblau-idm:himmelblau:*:*:*:*:*:*:*:* Versions before 3.1.0 Vulnerable ·himmelblau-idm

Remediation

Fix · CNA himmelblau (himmelblau-idm) Fixed in 3.1.0

Timeline

2026-10-02 Threatist record created from CVE-2026-31957
2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 1

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

TI-2026-24522 himmelblaud-tasks: local privilege escalation via /tmp symlink attack on Kerberos ccache CVSS 3.1HIGH 8.8
TI-2026-26683 himmelblau: NSS fake-primary group lookup reintroduces name collision risk CVSS 3.1HIGH 7.0
TI-2025-34616 Himmelblau's Kerberos credential cache collection is world readable CVSS 3.1HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences