CVE-2026-31957

critical · 10

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

0.5%

EPSS (exploit prob.)

42nd

EPSS percentile

2026-03-11

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-1188

Affected products

Vendor	Product	Affected versions
himmelblau-idm	himmelblau	< 3.1.0

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-31957