CVE-2026-45108
highpriority · track · 0OT risk · elevatedEPSS 0.002 · 16 %ileEUEPSS · scored 2026-10-27
Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 2.0.0 to before 3.1.5 and 2.3.11, Himmelblau contained an authentication bypass vulnerability in the Device Authorization Grant (DAG) flow that allowed a user within the same Entra ID domain to obtain a local Unix session as another user by providing their own valid credentials. The vulnerability existed in the token_validate function, which validated domain aliases for legitimate multi-domain scenarios but failed to verify that the local part (username) of the authenticated user's UPN matched the requested account username. The function only compared domains, not the complete usernames. This vulnerability is fixed in 3.1.5 and 2.3.11.
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
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references (4)
External citations — patches, advisories, analysis.
- https://github.com/himmelblau-idm/himmelblau/releasesPatchcnnvd
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-pmxh-j4r6-88mvcnnvd
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-pmxh-j4r6-88mvenisa_euvd
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-pmxh-j4r6-88mvnvd
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