himmelblau: NSS fake-primary group lookup reintroduces name collision risk
Published Apr 1, 2026
7.0
HIGHCVSS 3.1
EPSS 0.15%
Description
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.
Affected products
-
- Version >= 2.0.0-alpha, < 2.3.9StatusaffectedConstraints-
- Version >= 3.0.0-alpha, < 3.1.1StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Himmelblau-Idm | Himmelblau | n/a |
|
- ≥ 2.0.0 · < 2.3.9
- ≥ 3.0.0 · < 3.1.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (4)
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-17983 Advisory
- https://github.com/himmelblau-idm/himmelblau/releases/tag/2.3.9 x_refsource_MISCProductRelease Notes
- https://github.com/himmelblau-idm/himmelblau/releases/tag/3.1.1 x_refsource_MISCProductRelease Notes
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-v7xx-7mqc-g835 x_refsource_CONFIRMExploitMitigationVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-17983 | Advisory | |
| https://github.com/himmelblau-idm/himmelblau/releases/tag/2.3.9 | x_refsource_MISCProductRelease Notes | |
| https://github.com/himmelblau-idm/himmelblau/releases/tag/3.1.1 | x_refsource_MISCProductRelease Notes | |
| https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-v7xx-7mqc-g835 | x_refsource_CONFIRMExploitMitigationVendor Advisory |
Change history (0)
No recorded changes yet.