EUVD-2026-17983
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
3Description
Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From versions 2.0.0-alpha to before 2.3.9 and 3.0.0-alpha to before 3.1.1, there is a conditional local privilege escalation vulnerability in an edge-case naming collision. Only authenticated himmelblau users whose mapped CN/short name exactly matches a privileged local group name (e.g., "sudo", "wheel", "docker", "adm") can cause the NSS module to resolve that group name to their fake primary group. If the system uses NSS results for group-based authorization decisions (sudo, polkit, etc.), this can grant the attacker the privileges of that group. This issue has been patched in versions 2.3.9 and 3.1.1.
Analysis
Local privilege escalation in Himmelblau versions 2.0.0-alpha through 2.3.8 and 3.0.0-alpha through 3.1.0 allows authenticated users to assume privileged group membership when their Azure Entra ID-mapped CN or short name collides with system group names (sudo, wheel, docker, adm, etc.). The NSS module resolves the collision to the attacker's fake primary group, potentially granting group-level privileges if the system uses NSS for authorization decisions. …
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