CVE-2026-31957
criticalpriority · track · 0OT risk · elevatedEPSS 0.005 · 43 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (4)
External citations — patches, advisories, analysis.
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-q746-m2wv-qh4vcnnvd
- https://himmelblau-idm.org/downloads/Patchcnnvd
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-q746-m2wv-qh4venisa_euvd
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-q746-m2wv-qh4vMitigationVendor Advisorynvd
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